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One Way Check Valve w/ 9/16-18 Male EndOur one way check valve uses a 1lb check valve inside our adapter which allows the gas only to flow one way which we have marked! This would allow a diver to switch underwater with no water inside your hoses!! The Bc connection end is a Seaquest type! The other end uses a 9/16-18 male end to allow you to connect to low pressure hoses! The check valve allows the air "gas" to flow only one way! The check valve is marked with the direction of your gas flow to give you a quick check before testing your system out! Solid electro plated finish makes this adapter very durable in salt or fresh water use and for long life! Our check valve is an awesome adapter for off board gas connections for rebreathers! Purchase our Combo kit if you need both adapters!