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Brass, plastic and alloy flanged back nuts with British Standard Pipe Threads (BSP).
1 inch BSP brass back nut.
1-1/2 inch BSP alloy back nut.
This is the size for a bath or kitchen sink waste.
1-1/2 inch BSP brass back nut.
This is the size used on kitchen sink and bath wastes.
1-1/2 inch BSP plastic back nut, suits bath and kitchen sink wastes, also suitable for toilet cistern syphons.
Colour may vary.
1-1/4 inch BSP alloy back nut.
This is the normal size for a bathroom wash hand basin waste.
1-1/4 inch BSP brass back nut, this is the size used on a bathroom wash hand basin waste.
1-1/4 inch BSP plastic back nut for bathroom wash hand basin wastes.
1/2 inch BSP brass back nut.
This is the size you need for bathroom wash hand basin / kitchen sink taps.
This 1/2 inch BSP plastic back nut is the size for traditional kitchen sink / bathroom basin taps (colour may vary).
2 inch BSP brass back nut.
3/4 inch BSP brass flanged back nut.
This is the size needed for bath taps.
This 3/4 inch BSP plastic back nut is the right size for bath taps - colour may vary.
3/8 inch BSP brass back nut.