Model D Rev C Pressure Reducing Regulator; SALES B KIT FOR PRODUCT CODE: 2C5-3B07-1C000000C; Tfe-Silicate Gaskets; 3/4" Size; Bronze Body & Spring Chamber (Opt-5): Cryogenic Construction;;Opt-55: Cleaned For Oxygen Service Per Spec #S-1134; B0 Trim: Brass Metal Seat,Phos.Bronze Diaphragm;