This nifty valve kit from the Source has a cylindrical shape which requires no special mouth orientation, and a retreat spring mechanism that means it\'s completely leakproof even under pressure. With omni-directional operation and integrated twist shut-off its a high spec piece of gear that will always deliver.FeaturesCylindrical shape requires no special mouth orientationBite valve - Unique mechanism delivers full flow with just a soft bite.Retreat spring mechanism - Will not leak even under pressure or with prolonged use.Built-in bayonet style shut offOmni directional operationIntegral lock - Integrated twist shut-off.Long wearing designDirt Shield Valve coverAngled valve