If you're making up your own gas hoses for use in your motor-home or camper-van, perhaps to connect to an external [gas camping cooker[32595]], or perhaps because if have some other requirement elsewhere it's almost certain to involve 8mm flexible gas hose and some form of threaded fitting for the ends.
This well-engineered brass BSPT hose nozzle pushes into 8mm (5/16”) internal diameter flexible hose on one end, and is threaded 1/2” BSP female on the other end.
If this isn't the exact size you want, we also offer: