Brass 1/2 inch BSP mains pressure BS1212 part 1 float valve (ball-cock) with extra long tail and short arm.
WHERE TO USE :
Drinking troughs - In tight spaces.
Threaded ball mounting end has 5/16 inch British Standard Whitworth (BSW) thread - use standard 4-1/2 or 6 inch float.
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.