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Ball-cock (Float) 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 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 :

BS1212 Part 1 brass ballcock / float valves are used in older cold water storage tanks and heating feed / expansion tanks.

BS1212 Part 2 brass ballcock / float valves are used in modern cold water storage tanks and heating feed / expansion tanks.

BS1212 Part 3 plastic ballcock / float valves are used as inlet / fill valves in older toilet cisterns.

BS1212 Part 4 plastic ballcock / float 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" Brass Part 1 Ball Cock / Float Valve High Pressure
Brass 1/2 inch BSP part 1 high pressure BS1212 ball-cock / float valve
Often called a Portsmouth valve, these are commonly used as a cold water storage tank inlet / fill valve.
£5.37
1/2" Brass Part 1 Ball Cock / Float Valve High Pressure
Brass 1/2 inch BSP part 1 high pressure BS1212 ball-cock / float valve
Often called a Portsmouth valve, these are commonly used as a cold water storage tank inlet / fill valve.
£5.37
1/2" Brass Part 1 Ball Cock / Float Valve Low Pressure
Brass 1/2 inch low pressure BS1212 part 1 ball-cock / float valve.
The internal components of this valve are larger than those in the high pressure version, to allow a better flow of water.
£9.75
1/2" Brass Part 1 Ball Cock / Float Valve Low Pressure
Brass 1/2 inch low pressure BS1212 part 1 ball-cock / float valve.
The internal components of this valve are larger than those in the high pressure version, to allow a better flow of water.
£9.75
1/2" Brass Part 2 Ball Cock / Float Valve High Pressure
Brass high pressure 1/2 inch BS1212 part 2 ball-cock / float valve.
Quieter than the part 1 version and offers better protection against backflow.
£6.45
1/2" Brass Part 2 Ball Cock / Float Valve High Pressure
Brass high pressure 1/2 inch BS1212 part 2 ball-cock / float valve.
Quieter than the part 1 version and offers better protection against backflow.
£6.45
1/2" Male x 3/8" Female BSP Brass Adaptor
1/2 inch x 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 x 3/8" Female BSP Brass Adaptor
1/2 inch x 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" Part 1 Ball Cock Valve & Float
Brass 1/2 inch BSP part 1 high pressure BS1212 ballcock / float valve complete with ball / float.
High pressure, suitable for mains pressure water.
£5.99
1/2" Part 1 Ball Cock Valve & Float
Brass 1/2 inch BSP part 1 high pressure BS1212 ballcock / float valve complete with ball / float.
High pressure, suitable for mains pressure water.
£5.99
1/2" Part 2 Ball Cock Valve & Float
Brass 1/2 inch BSP BS1212 part 2 ballcock / float valve complete with ball / float.
Part 2 valves are quieter than the part 1 version and offer better protection against backflow.
£6.49
1/2" Part 2 Ball Cock Valve & Float
Brass 1/2 inch BSP BS1212 part 2 ballcock / float valve complete with ball / float.
Part 2 valves are quieter than the part 1 version and offer better protection against backflow.
£6.49
1" Brass Part 1 Ball Cock / Float Valve High Pressure
Brass 1 inch BSP mains pressure BS1212 ball-cock / float valve (industrial size - NOT normally used in a house).
£28.99
1" Brass Part 1 Ball Cock / Float Valve High Pressure
Brass 1 inch BSP mains pressure BS1212 ball-cock / float valve (industrial size - NOT normally used in a house).
£28.99
3/4" Brass Part 1 Ball Cock / Float Valve High Pressure
Brass 3/4 inch BSP BS1212 part 1 ball-cock / float valve (industrial size, not normally used in a house).
£14.85
3/4" Brass Part 1 Ball Cock / Float Valve High Pressure
Brass 3/4 inch BSP BS1212 part 1 ball-cock / float valve (industrial size, not normally used in a house).
£14.85
6" Float For 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.
£5.59
6" Float For 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.
£5.59
8" Float For 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).
£16.89
8" Float For 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).
£16.89
Blue 4-1/2" Float For 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.
£1.26
Blue 4-1/2" Float For 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.
£1.26
Brass Piston For Part 1 Ball Cock / Float Valve
Brass piston for high pressure 1/2 inch BS1212 part 1 float valve / ball-cock.
Complete with washer.
£4.35
Brass Piston For Part 1 Ball Cock / Float Valve
Brass piston for high pressure 1/2 inch BS1212 part 1 float valve / ball-cock.
Complete with washer.
£4.35
Brass Split / Cotter Pin For Part 1 Ball Cock / Float 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 Ball Cock / Float Valve
Brass split pin for part 1 BS1212 ball-cock / float valve, approx 3/16 inch diameter.
£0.55
Brass Split / Cotter Pin Part 2 Ball Cock / Float Valve
Brass split pin for part 2 BS1212 ball-cock / float valve, approx 1/8 inch diameter.
£0.36
Brass Split / Cotter Pin Part 2 Ball Cock / Float Valve
Brass split pin for part 2 BS1212 ball-cock / float valve, approx 1/8 inch diameter.
£0.36
Copper 4-1/2" Float For Ball Cock Valve
4-1/2 inch copper float for use with 1/2 inch BS1212 ball-cock / float valve.
£11.16
Copper 4-1/2" Float For Ball Cock Valve
4-1/2 inch copper float for use with 1/2 inch BS1212 ball-cock / float valve.
£11.16
Cylindrical Float For Ball Cock Valve
Cylinder shape float for use with 1/2 inch BS1212 float valves / ball-cocks.
Great item when space is tight in a toilet cistern.
£2.36
Cylindrical Float For Ball Cock Valve
Cylinder shape float for use with 1/2 inch BS1212 float valves / ball-cocks.
Great item when space is tight in a toilet cistern.
£2.36
Delchem B704A 1/2" Bottom Entry Toilet Inlet / Fill Valve
Delchem B704A bottom entry 1/2 inch BSP plastic float valve / ball-cock, for your WC / toilet cistern.
£6.73
Delchem B704A 1/2" Bottom Entry Toilet Inlet / Fill Valve
Delchem B704A bottom entry 1/2 inch BSP plastic float valve / ball-cock, for your WC / toilet cistern.
£6.73
Delchem B801A 1/2" Side Entry Toilet Inlet / Fill Valve
Delchem B801A side entry 1/2 inch BSP plastic toilet cistern float valve / ball-cock.
Adjustable length arm.
£4.22
Delchem B801A 1/2" Side Entry Toilet Inlet / Fill Valve
Delchem B801A side entry 1/2 inch BSP plastic toilet cistern float valve / ball-cock.
Adjustable length arm.
£4.22
Diaphragm Washer For Part 2 / 3 Ball Cock / Float Valve
Rubber washer for brass part 2 & plastic part 3 float valves / ball-cocks including Delchem and many other brands.
Replacing this washer can often fix problems with slow filling toilet cisterns and float valves that won't shut off.
£0.58
Diaphragm Washer For Part 2 / 3 Ball Cock / Float Valve
Rubber washer for brass part 2 & plastic part 3 float valves / ball-cocks including Delchem and many other brands.
Replacing this washer can often fix problems with slow filling toilet cisterns and float valves that won't shut off.
£0.58
Float Height Adjuster Clamp For Part 2 Ball Cock Valve
Brass float height adjuster clamp for BS1212 part 2 ball-cock / float valve.
£1.65
Float Height Adjuster Clamp For Part 2 Ball Cock Valve
Brass float height adjuster clamp for BS1212 part 2 ball-cock / float valve.
£1.65
Fluidmaster 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.
£3.79
Fluidmaster 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.
£3.79
Ideal / Armitage Hushflow & Univalve Diaphragm Washers Twin Pack
Twin pack of Armitage Shanks / Ideal Standard toilet cistern ballcock / fill float valve diaphragm washers
Hushflow diaphragm suits the older screw cap (quiet) 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 ballcock / fill float valve diaphragm washers
Hushflow diaphragm suits the older screw cap (quiet) valve.
Univalve diaphragm suits the newer twist cap valve.
£6.95
Ideal / Armitage Hushflow Diaphragm Washer
Armitage Shanks / Ideal Standard Hushflow (quiet) toilet cistern fill / float valve (ball-cock) 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…
£2.56
Ideal / Armitage Hushflow Diaphragm Washer
Armitage Shanks / Ideal Standard Hushflow (quiet) toilet cistern fill / float valve (ball-cock) 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…
£2.56
Ideal / Armitage Univalve Diaphragm Washer
Armitage Shanks / Ideal Standard Univalve toilet cistern fill / float valve (ball-cock) diaphragm washer.
Suits the newer twist cap style of inlet valve / ballcock supplied with many Armitage Shanks and Ideal Standard toilet cisterns. It will not fit the older Hushflow screw top…
£5.25
Ideal / Armitage Univalve Diaphragm Washer
Armitage Shanks / Ideal Standard Univalve toilet cistern fill / float valve (ball-cock) diaphragm washer.
Suits the newer twist cap style of inlet valve / ballcock supplied with many Armitage Shanks and Ideal Standard toilet cisterns. It will not fit the older Hushflow screw top…
£5.25
Long Tail / Short Arm 1/2" Brass Part 1 Ball Cock / Float Valve
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" Brass Part 1 Ball Cock / Float Valve
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 Ball cock / Float Valve
Replacement plastic outlet piece for part 2 ball-cock / float valve.
£1.25
Plastic Outlet Piece For Part 2 Ball cock / Float Valve
Replacement plastic outlet piece for part 2 ball-cock / float valve.
£1.25
Plastic Piston For Part 1 Ball Cock / Float 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 Ball Cock / Float Valve
Plastic piston with washer for 1/2 inch high pressure BS1212 part 1 ball-cock / float valve.
£0.82
Red 4-1/2" Float For 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
Red 4-1/2" Float For 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
Red Low Pressure Valve Seat For 1/2" Ball Cock / Float Valve
Low pressure seat for 1/2 inch BS1212 part 2 / 3 ball-cock / float valve.
£0.78
Red Low Pressure Valve Seat For 1/2" Ball Cock / Float Valve
Low pressure seat for 1/2 inch BS1212 part 2 / 3 ball-cock / float valve.
£0.78
Repair Kit For Part 1 and 2 Ball Cock / Float 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 Ball Cock / Float 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 Ball Cock / Float Valve
Repair kit for part 1 ball-cock / float valve.
Kit includes piston (with washer) and brass split pin
£1.52
Repair Kit For Part 1 Ball Cock / Float Valve
Repair kit for part 1 ball-cock / float valve.
Kit includes piston (with washer) and brass split pin
£1.52
Repair Kit For Part 2 Ball Cock / Float Valve
Repair kit for part 2 ball-cock / float valve.
Kit includes diaphragm washer and brass split pin.
£1.66
Repair Kit For Part 2 Ball Cock / Float Valve
Repair kit for part 2 ball-cock / float valve.
Kit includes diaphragm washer and brass split pin.
£1.66
Siamp 99B 1/2" Bottom Entry Toilet Inlet / Fill Valve
1/2 inch BSP Siamp Monaco compact 99B bottom entry WC / toilet cistern float / inlet fill valve (ball-cock).
Water level adjustable by simple manual screw turning (no tools needed).
£11.37
Siamp 99B 1/2" Bottom Entry Toilet Inlet / Fill Valve
1/2 inch BSP Siamp Monaco compact 99B bottom entry WC / toilet cistern float / inlet fill valve (ball-cock).
Water level adjustable by simple manual screw turning (no tools needed).
£11.37
Siamp Diaphragm Washer
Siamp diaphragm washer, suits Siamp 99B, 95L and 95B toilet cistern fill / float valves / ball-cocks.
These washers can fail with a little tear in the rubber part, which in turn makes the toilet cistern very slow to fill.
£3.24
Siamp Diaphragm Washer
Siamp diaphragm washer, suits Siamp 99B, 95L and 95B toilet cistern fill / float valves / ball-cocks.
These washers can fail with a little tear in the rubber part, which in turn makes the toilet cistern very slow to fill.
£3.24
Tail / Valve Seat Washer For Ball Cock / Float Valve
Ball-cock / float valve tail washer for 1/2 inch valve.
£0.25
Tail / Valve Seat Washer For Ball Cock / Float Valve
Ball-cock / float valve tail washer for 1/2 inch valve.
£0.25
Torbeck 1/2" Bottom Entry Fill Valve
1/2 inch Torbeck B661AT bottom entry toilet cistern fill / float valve.
Quiet and fast filling.
Anti-syphon design prevents contamination of fresh water supply.
£13.99
Torbeck 1/2" Bottom Entry Fill Valve
1/2 inch Torbeck B661AT bottom entry toilet cistern fill / float valve.
Quiet and fast filling.
Anti-syphon design prevents contamination of fresh water supply.
£13.99
Torbeck 1/2" Side Entry Fill Valve
1/2 inch Torbeck B610 side inlet toilet cistern fill / float valve.
Quiet and fast filling.
Anti-syphon design prevents contamination of fresh water supply.
£10.71
Torbeck 1/2" Side Entry Fill Valve
1/2 inch Torbeck B610 side inlet toilet cistern fill / float valve.
Quiet and fast filling.
Anti-syphon design prevents contamination of fresh water supply.
£10.71
Torbeck 3/8" Bottom Entry Fill Valve
3/8 inch Torbeck bottom entry toilet cistern fill / float valve.
Quiet and fast filling.
Anti-syphon design prevents contamination of fresh water supply.
£19.70
Torbeck 3/8" Bottom Entry Fill Valve
3/8 inch Torbeck bottom entry toilet cistern fill / float valve.
Quiet and fast filling.
Anti-syphon design prevents contamination of fresh water supply.
£19.70
Torbeck 3/8" Side Entry Fill Valve
3/8 inch Torbeck B610-3/8B side inlet toilet cistern fill / float valve.
Quiet and fast filling.
Anti-syphon design prevents contamination of fresh water supply.
£12.76
Torbeck 3/8" Side Entry Fill Valve
3/8 inch Torbeck B610-3/8B side inlet toilet cistern fill / float valve.
Quiet and fast filling.
Anti-syphon design prevents contamination of fresh water supply.
£12.76
Torbeck Diaphragm Washer
This Torbeck diaphragm is one of the most common WC / toilet cistern ball-cock / fill valve washers.
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.
£2.37
Torbeck Diaphragm Washer
This Torbeck diaphragm is one of the most common WC / toilet cistern ball-cock / fill valve washers.
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.
£2.37
Torbeck Fill Valve Replacement Arm
Clip on replacement arm for Torbeck toilet cistern ball-cock / float valve.
£1.69
Torbeck Fill Valve Replacement Arm
Clip on replacement arm for Torbeck toilet cistern ball-cock / float valve.
£1.69
Washer For High Pressure 1/2" Part 1 Ball Cock / Float 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 Ball Cock / Float 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 Ball Cock / Float Valve
Low pressure washer for old type BS1212 part 1 1/2 inch ball-cock / float valve.
Measures approx 19.5mm x 3.3mm.
£0.27
Washer For Low Pressure 1/2" Part 1 Ball Cock / Float Valve
Low pressure washer for old type BS1212 part 1 1/2 inch ball-cock / float valve.
Measures approx 19.5mm x 3.3mm.
£0.27
Water Tank Support Plate For Ball Cock / Float Valve
Metal support plate for the ball-cock / float valve in your plastic cold water tank.
Approx 75mm x 75mm x 0.9mm thick.
£1.96
Water Tank Support Plate For Ball Cock / Float Valve
Metal support plate for the ball-cock / float valve in your plastic cold water tank.
Approx 75mm x 75mm x 0.9mm thick.
£1.96
White High Pressure Valve Seat For 1/2" Ball Cock / Float Valve
High pressure ballcock valve seat, for 1/2 inch BS1212 ball-cock / float valve.
£0.72
White High Pressure Valve Seat For 1/2" Ball Cock / Float Valve
High pressure ballcock valve seat, for 1/2 inch BS1212 ball-cock / float valve.
£0.72
Wisa 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 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