Model "4381" Pressure Reducing Regulator, Tfe Gasket/O-Ring; 1/2" Body With 1" Size Reducing Flanges; 316l SST Body & Cf3m SST Spring Chamber; S3 Trim: 316l SST With Tfe Seat,Neoprene (Bc)Diaphragm; Opt-30: 300 Lb Stainless Steel Raised Face Flanges; 5-30 PSIG Range Spring