Model "D" Pressure Reducing Regulator, Tfe Gaskets; 1/2" Size; Cf8m Body,Lcc Spring Chamber; S2 Trim: 416SST Metal Seat,302SST Diaphragm; Opt-34: 300 Lb Raised Face Flanges With 14" Face To Face Dimension; 2-15 PSIG Range Spring; Standard: Opt-25: 1/8" Npt Spring Chamber Vent Tap