Model D Rev C Pressure Reducing Regulator; Tfe-Silicate Gaskets; 1" Size; Sales KIt B; Bronze Body & Spring Chamber (Opt-5+80), 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-80: 100-250 PSIG SST Range Spring