1/2″ BSP Ball Valve

Used as part of the drain system in the barrel. Connects to 1/2″ BSP running nipple which passes through the barrel. Once the cycle is over, the barrel can be drained through this valve. 

For more information, please read my article on building a steriliser barrel. 

https://archersmushrooms.co.uk/how-to-build-a-drum-steriliser-for-mushroom-growing/