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Ball-cock Valves

Float / ball-cock valves are used to automatically control the level of water in a storage tank or toilet cistern. A moving ball / float rises with the water and operates the valve, shutting off the water supply when it is at the correct level.

Interesting fact : the modern ballcock valve was invented by José Antonio de Alzate y Ramírez, a Mexican priest and scientist, who in 1790 described the valve in the Gaceta de Literatura Méxicana.

Typical applications :

Part 1 brass float / ball-cock valves are used in older cold water tanks and central heating feed and expansion (header) tanks.

Part 2 brass float / ball-cock valves are used in modern cold water tanks and central heating feed and expansion (header) tanks.

Part 3 plastic float / ball-cock valves are used as inlet / fill valves in older toilet cisterns.

Part 4 plastic float / ball-cock valves are used as inlet / fill valves in modern toilet cisterns.

The threaded connections of these ballcock valves use a British Standard Pipe Thread size - see BSPT link at bottom of page for more info.

1/2" Ball-cock Valve And Ball / Float | High Pressure | Part 1 BS1212/1
Brass 1/2 inch BSP part 1 high pressure BS1212 ball-cock / float valve complete with ball / float.
High pressure, suitable for mains pressure water.
£5.99
1/2" Ball-cock Valve And Ball / Float | High Pressure |…
Brass 1/2 inch BSP part 1 high pressure BS1212 ball-cock / float valve complete with ball / float.
High pressure, suitable for mains pressure water.
£5.99
1/2" Ball-cock Valve And Ball / Float | High Pressure | Part 2 BS1212/2
Brass 1/2 inch BSP BS1212 part 2 ball-cock / float valve complete with ball / float.
Part 2 ballcock valves are quieter than the part 1 version and give better protection against backflow.
Use in cold water storage tank, central heating feed and expansion header tank,…
£6.49
1/2" Ball-cock Valve And Ball / Float | High Pressure |…
Brass 1/2 inch BSP BS1212 part 2 ball-cock / float valve complete with ball / float.
Part 2 ballcock valves are quieter than the part 1 version and give better protection against backflow.
Use in cold water storage tank, central heating feed and expansion header tank,…
£6.49
1/2" Float / Ball-cock Valve | High Pressure | Part 1 BS1212/1
Brass 1/2 inch BSP part 1 high pressure BS1212 ball-cock / float valve
Often called a Portsmouth valve, these ballcocks are commonly used as a cold water storage tank inlet / fill valve.
£5.37
1/2" Float / Ball-cock Valve | High Pressure | Part 1 BS1212/1
Brass 1/2 inch BSP part 1 high pressure BS1212 ball-cock / float valve
Often called a Portsmouth valve, these ballcocks are commonly used as a cold water storage tank inlet / fill valve.
£5.37
1/2" Float / Ball-cock Valve | High Pressure | Part 2 BS1212/2
Brass high pressure 1/2 inch BS1212 part 2 ball-cock / float valve.
Quieter than a part 1 ballcock and offers better protection against backflow.
£6.45
1/2" Float / Ball-cock Valve | High Pressure | Part 2 BS1212/2
Brass high pressure 1/2 inch BS1212 part 2 ball-cock / float valve.
Quieter than a part 1 ballcock and offers better protection against backflow.
£6.45
1/2" Float / Ball-cock Valve | Low Pressure | Part 1 BS1212/1
Brass 1/2 inch low pressure BS1212 part 1 ball-cock / float valve.
The internal components of this ballcock valve are larger than those in the high pressure version, to allow a better flow of water.
£8.20
1/2" Float / Ball-cock Valve | Low Pressure | Part 1 BS1212/1
Brass 1/2 inch low pressure BS1212 part 1 ball-cock / float valve.
The internal components of this ballcock valve are larger than those in the high pressure version, to allow a better flow of water.
£8.20
1/2" Male to 3/8" Female BSP Brass Adaptor With Washer
1/2 inch to 3/8 inch BSP brass adaptor with washer.
Useful for adapting the 3/8 thread on European toilet ball-cock / float valves to the (more common in the UK) 1/2 inch size.
£1.50
1/2" Male to 3/8" Female BSP Brass Adaptor With Washer
1/2 inch to 3/8 inch BSP brass adaptor with washer.
Useful for adapting the 3/8 thread on European toilet ball-cock / float valves to the (more common in the UK) 1/2 inch size.
£1.50
1" Float / Ball-cock Valve | High Pressure | Part 1 BS1212/1
Brass 1 inch BSP BS1212 part 1 ball-cock / float valve.
This bigger than normal ballcock valve is more usually found in an industrial environment (it's not going to be in your house, unless you live in a mansion).
£28.99
1" Float / Ball-cock Valve | High Pressure | Part 1 BS1212/1
Brass 1 inch BSP BS1212 part 1 ball-cock / float valve.
This bigger than normal ballcock valve is more usually found in an industrial environment (it's not going to be in your house, unless you live in a mansion).
£28.99
3/4" Float / Ball-cock Valve | High Pressure | Part 1 BS1212/1
Brass 3/4 inch BSP BS1212 part 1 ball-cock / float valve.
This bigger than normal ballcock valve is more usually found in an industrial environment (it's not going to be in your house, unless you live in a mansion).
£15.58
3/4" Float / Ball-cock Valve | High Pressure | Part 1 BS1212/1
Brass 3/4 inch BSP BS1212 part 1 ball-cock / float valve.
This bigger than normal ballcock valve is more usually found in an industrial environment (it's not going to be in your house, unless you live in a mansion).
£15.58
4-1/2" Blue Ball / Float For 1/2" Ball-cock Valve
4-1/2 inch diameter blue float / ball for use with 1/2 inch BS1212 ball-cock / float valve.
Brass threaded insert for float valve arm.
£1.32
4-1/2" Blue Ball / Float For 1/2" Ball-cock Valve
4-1/2 inch diameter blue float / ball for use with 1/2 inch BS1212 ball-cock / float valve.
Brass threaded insert for float valve arm.
£1.32
4-1/2" Copper Ball / Float For 1/2" Ball-cock Valve
4-1/2 inch copper float for use with 1/2 inch BS1212 ball-cock / float valve.
£11.66
4-1/2" Copper Ball / Float For 1/2" Ball-cock Valve
4-1/2 inch copper float for use with 1/2 inch BS1212 ball-cock / float valve.
£11.66
4-1/2" Red Ball / Float For 1/2" Ball-cock Valve
Red 4-1/2 inch diameter float / ball for use with 1/2 inch BS1212 ball-cock / float valve.
Brass threaded insert for float valve arm.
£1.17
4-1/2" Red Ball / Float For 1/2" Ball-cock Valve
Red 4-1/2 inch diameter float / ball for use with 1/2 inch BS1212 ball-cock / float valve.
Brass threaded insert for float valve arm.
£1.17
6" Ball / Float For 3/4" or 1/2" Ball-cock Valve
6 inch diameter plastic float / ball for use with standard 1/2 inch and 3/4 inch BS1212 ball-cock / float valve.
Due to greater surface area and weight, a 6 inch float may help with water hammer problems.
Brass threaded insert.
£4.72
6" Ball / Float For 3/4" or 1/2" Ball-cock Valve
6 inch diameter plastic float / ball for use with standard 1/2 inch and 3/4 inch BS1212 ball-cock / float valve.
Due to greater surface area and weight, a 6 inch float may help with water hammer problems.
Brass threaded insert.
£4.72
8" Ball / Float For 1" Ball-cock Valve
8 inch diameter float / ball for use with 1 inch BS1212 ball-cock / float valve.
*** Industrial size - NOT normally used in a house ***
Brass threaded insert.
£17.73
8" Ball / Float For 1" Ball-cock Valve
8 inch diameter float / ball for use with 1 inch BS1212 ball-cock / float valve.
*** Industrial size - NOT normally used in a house ***
Brass threaded insert.
£17.73
Brass Piston For Part 1 Float / Ball-cock Valve
Brass piston for high pressure 1/2 inch BS1212 part 1 float valve / ball-cock.
Complete with washer.
£4.57
Brass Piston For Part 1 Float / Ball-cock Valve
Brass piston for high pressure 1/2 inch BS1212 part 1 float valve / ball-cock.
Complete with washer.
£4.57
Brass Split / Cotter Pin For Part 1 Float / Ball-cock Valve
Brass split pin for part 1 BS1212 ball-cock / float valve, approx 3/16 inch diameter.
£0.55
Brass Split / Cotter Pin For Part 1 Float / Ball-cock Valve
Brass split pin for part 1 BS1212 ball-cock / float valve, approx 3/16 inch diameter.
£0.55
Brass Split / Cotter Pin For Part 2 Float / Ball-cock Valve
Brass split pin for part 2 BS1212 ball-cock / float valve, approx 1/8 inch diameter.
£0.36
Brass Split / Cotter Pin For Part 2 Float / Ball-cock Valve
Brass split pin for part 2 BS1212 ball-cock / float valve, approx 1/8 inch diameter.
£0.36
Cylindrical Float For 1/2" Ball-cock Valve
Slim cylinder shape float for use with 1/2 inch BS1212 float valves / ball-cocks.
Great item when space is tight in a toilet cistern.
Brass threaded insert.
£2.36
Cylindrical Float For 1/2" Ball-cock Valve
Slim cylinder shape float for use with 1/2 inch BS1212 float valves / ball-cocks.
Great item when space is tight in a toilet cistern.
Brass threaded insert.
£2.36
Delchem B704A 1/2" Bottom Entry Ball-cock / Float Valve
Delchem B704A bottom entry 1/2 inch BSP plastic float valve / ball-cock, for WC / toilet cistern.
Adjustable length arm (adjusts from 6 inches to 9 inches long).
£6.64
Delchem B704A 1/2" Bottom Entry Ball-cock / Float Valve
Delchem B704A bottom entry 1/2 inch BSP plastic float valve / ball-cock, for WC / toilet cistern.
Adjustable length arm (adjusts from 6 inches to 9 inches long).
£6.64
Delchem B801A 1/2" Side Entry Ball-cock / Float Valve
Delchem B801A side entry 1/2 inch BSP plastic toilet cistern float valve / ball-cock.
Adjustable length arm.
£4.27
Delchem B801A 1/2" Side Entry Ball-cock / Float Valve
Delchem B801A side entry 1/2 inch BSP plastic toilet cistern float valve / ball-cock.
Adjustable length arm.
£4.27
Float / Ball-cock Valve Diaphragm Washer
Diaphragm washer for brass part 2 or plastic part 3 fill / float valves / ball-cocks.
Replacing this washer can often fix problems with slow filling toilet cisterns and ball-cock valves that won't shut off.
£0.58
Float / Ball-cock Valve Diaphragm Washer
Diaphragm washer for brass part 2 or plastic part 3 fill / float valves / ball-cocks.
Replacing this washer can often fix problems with slow filling toilet cisterns and ball-cock valves that won't shut off.
£0.58
Float Height Adjuster Clamp For Part 2 Ball-cock Valve
This brass adjuster clamp goes on the bent arm on a BS1212 part 2 ball-cock / float valve and makes the connection to the ball / float.
For use with standard 4-1/2 or 6 inch float.
£1.65
Float Height Adjuster Clamp For Part 2 Ball-cock Valve
This brass adjuster clamp goes on the bent arm on a BS1212 part 2 ball-cock / float valve and makes the connection to the ball / float.
For use with standard 4-1/2 or 6 inch float.
£1.65
Fluidmaster Float Valve Diaphragm Washer
Fluidmaster 242MP071 toilet cistern ball-cock / float valve diaphragm washer / seal, suitable for high and low water pressure.
For use with Fluidmaster float valve models 400 and 747.
£3.98
Fluidmaster Float Valve Diaphragm Washer
Fluidmaster 242MP071 toilet cistern ball-cock / float valve diaphragm washer / seal, suitable for high and low water pressure.
For use with Fluidmaster float valve models 400 and 747.
£3.98
Ideal / Armitage Hushflow & Univalve Diaphragm Washers Twin Pack
Twin pack of Armitage Shanks / Ideal Standard toilet cistern ball-cock / fill float valve diaphragm washers
Hushflow diaphragm suits the older screw cap (quiet) ballcock valve.
Univalve diaphragm suits the newer twist cap valve.
£6.95
Ideal / Armitage Hushflow & Univalve Diaphragm Washers Twin Pack
Twin pack of Armitage Shanks / Ideal Standard toilet cistern ball-cock / fill float valve diaphragm washers
Hushflow diaphragm suits the older screw cap (quiet) ballcock valve.
Univalve diaphragm suits the newer twist cap valve.
£6.95
Ideal Standard / Armitage Shanks Hushflow Float Valve Diaphragm Washer
Armitage Shanks / Ideal Standard Hushflow quiet toilet cistern ball-cock fill / float valve diaphragm washer.
Suits the older screw cap style of inlet valve / ballcock supplied with many Armitage Shanks and Ideal Standard toilet cisterns. It will not fit the newer Univalve twist…
£2.56
Ideal Standard / Armitage Shanks Hushflow Float Valve Diaphragm Washer
Armitage Shanks / Ideal Standard Hushflow quiet toilet cistern ball-cock fill / float valve diaphragm washer.
Suits the older screw cap style of inlet valve / ballcock supplied with many Armitage Shanks and Ideal Standard toilet cisterns. It will not fit the newer Univalve twist…
£2.56
Ideal Standard / Armitage Shanks Univalve Float Valve Diaphragm Washer
Armitage Shanks / Ideal Standard Univalve toilet cistern fill / float valve (ball-cock) diaphragm washer.
Suits the newer Univalve twist cap style of inlet valve / ballcock supplied with many Armitage and Ideal toilet cisterns. It will not fit the older Hushflow screw top valve.
£5.52
Ideal Standard / Armitage Shanks Univalve Float Valve Diaphragm Washer
Armitage Shanks / Ideal Standard Univalve toilet cistern fill / float valve (ball-cock) diaphragm washer.
Suits the newer Univalve twist cap style of inlet valve / ballcock supplied with many Armitage and Ideal toilet cisterns. It will not fit the older Hushflow screw top valve.
£5.52
Long Tail / Short Arm 1/2" Float / Ball-cock Valve | Part 1 BS1212/1
Brass 1/2 inch BSP mains pressure BS1212 part 1 float valve (ball-cock) with extra long tail and short arm.
Popular valve for use in tight spaces, like drinking troughs.
£9.29
Long Tail / Short Arm 1/2" Float / Ball-cock Valve | Part…
Brass 1/2 inch BSP mains pressure BS1212 part 1 float valve (ball-cock) with extra long tail and short arm.
Popular valve for use in tight spaces, like drinking troughs.
£9.29
Plastic Outlet Piece For Part 2 Float / Ball-cock Valve
Replacement plastic outlet piece for 1/2 inch part 2 ball-cock / float valve.
£1.25
Plastic Outlet Piece For Part 2 Float / Ball-cock Valve
Replacement plastic outlet piece for 1/2 inch part 2 ball-cock / float valve.
£1.25
Plastic Piston For Part 1 Float / Ball-cock Valve
Plastic piston with washer for 1/2 inch high pressure BS1212 part 1 ball-cock / float valve.
£0.82
Plastic Piston For Part 1 Float / Ball-cock Valve
Plastic piston with washer for 1/2 inch high pressure BS1212 part 1 ball-cock / float valve.
£0.82
Red Low Pressure Valve Seat For 1/2" Float / Ball-cock Valve
Low pressure seat for 1/2 inch BS1212 part 2 / 3 ball-cock / float valve.
Needed in your float valve in low pressure applications (gravity system).
£0.78
Red Low Pressure Valve Seat For 1/2" Float / Ball-cock Valve
Low pressure seat for 1/2 inch BS1212 part 2 / 3 ball-cock / float valve.
Needed in your float valve in low pressure applications (gravity system).
£0.78
Repair Kit For Part 1 and 2 Float / Ball-cock Valve
Universal repair kit for 1/2 inch part 1 and 2 ball-cock / float valve.
Kit includes tail washer, part 1 plastic piston with washer, brass split pins and part 2 diaphragm washer.
£2.16
Repair Kit For Part 1 and 2 Float / Ball-cock Valve
Universal repair kit for 1/2 inch part 1 and 2 ball-cock / float valve.
Kit includes tail washer, part 1 plastic piston with washer, brass split pins and part 2 diaphragm washer.
£2.16
Repair Kit For Part 1 Float / Ball-cock Valve
Repair kit for 1/2 inch part 1 ball-cock / float valve.
Kit includes plastic piston (with washer) and brass split pin
£1.52
Repair Kit For Part 1 Float / Ball-cock Valve
Repair kit for 1/2 inch part 1 ball-cock / float valve.
Kit includes plastic piston (with washer) and brass split pin
£1.52
Repair Kit For Part 2 Float / Ball-cock Valve
Repair kit for 1/2 inch part 2 ball-cock / float valve.
Kit includes diaphragm washer and brass split pin.
£1.66
Repair Kit For Part 2 Float / Ball-cock Valve
Repair kit for 1/2 inch part 2 ball-cock / float valve.
Kit includes diaphragm washer and brass split pin.
£1.66
Siamp 99B Toilet Cistern Inlet / Float Valve
1/2 inch BSP Siamp Monaco compact 99B bottom entry WC / toilet cistern float valve.
Water level adjustable by simple manual screw turning.
£11.96
Siamp 99B Toilet Cistern Inlet / Float Valve
1/2 inch BSP Siamp Monaco compact 99B bottom entry WC / toilet cistern float valve.
Water level adjustable by simple manual screw turning.
£11.96
Siamp Float Valve Diaphragm Washer
Siamp diaphragm washer, suits Siamp 99B, 95L and 95B toilet cistern fill / float valves / ball-cocks.
These washers can fail with a tear in the rubber part, which in turn makes the toilet cistern very slow to fill.
£3.43
Siamp Float Valve Diaphragm Washer
Siamp diaphragm washer, suits Siamp 99B, 95L and 95B toilet cistern fill / float valves / ball-cocks.
These washers can fail with a tear in the rubber part, which in turn makes the toilet cistern very slow to fill.
£3.43
Tail / Valve Seat Washer For Float / Ball-cock Valve
Ball-cock / float valve tail washer for 1/2 inch valve.
£0.25
Tail / Valve Seat Washer For Float / Ball-cock Valve
Ball-cock / float valve tail washer for 1/2 inch valve.
£0.25
Thomas Dudley Hydraflow Float Valve Diaphragm Washer
Diaphragm washer for Thomas Dudley Hydraflow toilet cistern fill / float valve (ball-cock).
Colour of plastic insert may vary.
£2.99
Thomas Dudley Hydraflow Float Valve Diaphragm Washer
Diaphragm washer for Thomas Dudley Hydraflow toilet cistern fill / float valve (ball-cock).
Colour of plastic insert may vary.
£2.99
Torbeck 1/2" Bottom Entry Float Valve
1/2 inch Torbeck B661AT bottom entry toilet cistern fill / float valve (ball-cock).
Quiet and fast filling.
Anti-syphon design prevents contamination of fresh water supply.
£14.04
Torbeck 1/2" Bottom Entry Float Valve
1/2 inch Torbeck B661AT bottom entry toilet cistern fill / float valve (ball-cock).
Quiet and fast filling.
Anti-syphon design prevents contamination of fresh water supply.
£14.04
Torbeck 1/2" Side Entry Float Valve
1/2 inch Torbeck B610 side inlet toilet cistern fill / float valve (ball-cock).
Quiet and fast filling.
Anti-syphon design prevents contamination of fresh water supply.
£10.71
Torbeck 1/2" Side Entry Float Valve
1/2 inch Torbeck B610 side inlet toilet cistern fill / float valve (ball-cock).
Quiet and fast filling.
Anti-syphon design prevents contamination of fresh water supply.
£10.71
Torbeck 3/8" Bottom Entry Float Valve
3/8 inch Torbeck bottom entry toilet cistern fill / float valve (ball-cock).
Quiet and fast filling.
Anti-syphon design prevents contamination of fresh water supply.
£19.90
Torbeck 3/8" Bottom Entry Float Valve
3/8 inch Torbeck bottom entry toilet cistern fill / float valve (ball-cock).
Quiet and fast filling.
Anti-syphon design prevents contamination of fresh water supply.
£19.90
Torbeck 3/8" Side Entry Float Valve
3/8 inch Torbeck B610-3/8B side inlet toilet cistern fill / float valve (ball-cock).
Quiet and fast filling.
Anti-syphon design prevents contamination of fresh water supply.
£12.90
Torbeck 3/8" Side Entry Float Valve
3/8 inch Torbeck B610-3/8B side inlet toilet cistern fill / float valve (ball-cock).
Quiet and fast filling.
Anti-syphon design prevents contamination of fresh water supply.
£12.90
Torbeck Diaphragm Washer for Float Valve
Diaphragm washer for Torbeck toilet cistern ball-cock / fill valve.
This is the new version of the diaphragm, though if needed it can easily be converted to the old type by simply removing the little plastic pin.
£2.44
Torbeck Diaphragm Washer for Float Valve
Diaphragm washer for Torbeck toilet cistern ball-cock / fill valve.
This is the new version of the diaphragm, though if needed it can easily be converted to the old type by simply removing the little plastic pin.
£2.44
Torbeck Float Valve Replacement Arm
Clip on replacement arm for Torbeck toilet cistern ball-cock / float valve.
£1.80
Torbeck Float Valve Replacement Arm
Clip on replacement arm for Torbeck toilet cistern ball-cock / float valve.
£1.80
Washer For High Pressure 1/2" Part 1 Float / Ball-cock Valve
Washer for 1/2 inch part 1 BS1212 high pressure ball-cock / float valve.
Measures approx 12.7mm x 3.3mm (colour may vary).
£0.25
Washer For High Pressure 1/2" Part 1 Float / Ball-cock Valve
Washer for 1/2 inch part 1 BS1212 high pressure ball-cock / float valve.
Measures approx 12.7mm x 3.3mm (colour may vary).
£0.25
Washer For Low Pressure 1/2" Part 1 Float / Ball-cock Valve
Low pressure washer for old type BS1212 1/2 inch part 1 ball-cock / float valve.
Measures approx 19.5mm x 3.3mm.
£0.27
Washer For Low Pressure 1/2" Part 1 Float / Ball-cock Valve
Low pressure washer for old type BS1212 1/2 inch part 1 ball-cock / float valve.
Measures approx 19.5mm x 3.3mm.
£0.27
Water Tank Metal Backplate for Float / Ball-cock Valve
Metal support backplate for the ball-cock / float valve in your plastic cold water tank.
Plate measures approx 75mm x 75mm x 0.9mm thick.
£2.13
Water Tank Metal Backplate for Float / Ball-cock Valve
Metal support backplate for the ball-cock / float valve in your plastic cold water tank.
Plate measures approx 75mm x 75mm x 0.9mm thick.
£2.13
White High Pressure Valve Seat For 1/2" Float / Ball-cock Valve
White high pressure valve seat, for 1/2 inch part 1, 2 & 3 BS1212 ball-cock / float valve.
Can be used to upgrade low pressure float valves to high pressure.
£0.72
White High Pressure Valve Seat For 1/2" Float / Ball-cock Valve
White high pressure valve seat, for 1/2 inch part 1, 2 & 3 BS1212 ball-cock / float valve.
Can be used to upgrade low pressure float valves to high pressure.
£0.72
Wisa Float Valve Diaphragm Washer
Wisa toilet cistern fill / float / ball-cock valve rubber diaphragm washer / membrane with support plate, suitable for high and low water pressure.
£4.62
Wisa Float Valve Diaphragm Washer
Wisa toilet cistern fill / float / ball-cock valve rubber diaphragm washer / membrane with support plate, suitable for high and low water pressure.
£4.62