NOS Our standard valve is unquestionably the best of its kind on the market. Key features include a large outlet port, CGA 660 outlet threads, an O–ring seal, and large internal ports. This valve can support systems to 400 plus HP. The newest versions of the NOS Hi–Flo(TM) valve are identified by the 45 degree handwheel, while earlier models had handwheels 90 degree to the valve. Available for 5 pound to 20 pound bottles.