Model D Rev C Pressure Reducing Regulator; Tfe-Silicate Gaskets; 1" Size; Sales Kit A; Lcc Steel Body & Spring Chamber For Temperatures Down To -50 F; S40c Trim: 316SST With Virgin Teflon (V-Tfe) Seat, Special Bc;Diaphragm; Opt-4: Stabilizer (Recommended For Gaseous Service Only); Opt-40: Construction Per Nace Standard Mr0175