Model D Rev C Pressure Reducing Regulator; SALES B KIT FOR PRODUCT CODE: 2C5-3B57-1A000T00C; Tfe-Silicate Gaskets; 3/4" Size; Bronze Body & Spring Chamber (Opt-5): Cryogenic Construction;;Opt-55: Cleaned For Oxygen Service Per Spec #S-1134; B5 Trim: Brass With Virgin Teflon (V-Tfe) Seat,Phos.Bronze Diaphragm; Opt-85: 1/8" Npt Body Tap