Our NOS Super Hi-Flo valve is one of the best available! Key features include a 1/8"NPT gauge port, 1/4"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™ valve are identified by the 45° handwheel and gauge port. This valve is a direct replacement for all NOS bottles, 5 lbs. and larger. Hi-Flo™ Nitrous Valve For NOS bottles 5 lbs. and larger