Brass hose union outside bib-tap (bib-cock), made to the British standard BS1010.
Inlet has standard 1/2 inch BSP thread (the most common size in the UK).
Includes hose union connection for standard garden hose, this has a 3/4 inch BSP thread, so it can be replaced with "hozelock" style hose adapters if needed (available separately).
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.