Model D Rev C; SALES B KIT FOR PRODUCT CODE: 2C4-DS17-1A40H000C; Pressure Reducing Regulator; Tfe-Silicate Gaskets; 1/2" Size; Lcc Steel Body & Spring Chamber For Temperatures Down To -50 F; S1 Trim: 316SST Metal Seat,302SST Diaphragm; Opt-4: Stabilizer (Recommended For Gaseous Service Only)