22mm gate type central heating pump valve, with nut and washer.
The 1-1/2 inch BSP (standard heating pump thread size) nut is designed a special way to allow it to be separated from the valve.
We sell the nut as a spare part on it's own if you need one.
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.