NOS Our NOS Super Hi-Flo valve is back and better than ever! Key features include a 1/8 in. NPT gauge port, 1/4 in. NPT accessory port, large outlet port, CGA #660 outlet threads, an O-ring seal, and large internal ports. This valve can support systems to 500+ HP. The newest versions of the NOS Super Hi-Flo(TM) valve are identified by the 45° handwheel, while earlier models had handwheels 90° to the valve. This valve is a direct replacement for all NOS bottles, 5 lbs. and larger.