This valve is a replacement part for the following NOS bottle part numbers; NOS 1 lb; 14705NOS NOS 2 lb: 14710NOS & 14710-PNOS NOS 2.5 lb; 14720NOS & 14720-PNOS. Valve kit includes a pre-installed PRD (Pressure Relief Device), a new O-ring seal as well as a blue 1/8" to -4 AN line fitting & brass siphon tube adapter. Hi-Flo™ Nitrous Bottle Valve For NOS 1 lb, 2 lb & 2.5 lb Bottles