Standard sized p trap for under your kitchen sink.
Needed to stop smells and creepy crawlies from coming back up the waste pipe.
1-1/2 inch BSP threaded inlet connection, compression type pipe outlet connection - suits push fit or solvent waste pipe.
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.