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Stevenson Plumbing and Electrical Supplies
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1-1/2 inch BSP alloy backnut.
This is the normal size for a bath or kitchen sink waste.
BSP (British Standard Pipe Thread) sizes don’t match up with what you would measure using a ruler. Have a look at the BSPT link at the bottom of this page for more information about how plumbing threads are measured.
Product Code: FUK
Brand : Generic