Stainless Steel Ball Valve 1/2inch BSP x 13mm Barb
Stainless Steel Ball Valve with 1/2inch BSP thread on the inlet and a 13mm barb on the outlet.
These can be used to fit a ball valve to a vessel, they come with a nut and silicone o-ring so can be used as a weldless fitting with a 20.5mm hole. Alternatively, they can be threaded into any 1/2inch BSP female fitting. The outlet has a 13mm barb pointing down.