Model "HP-1+6+S" Diff. Press Reducing Regulator,Non-Nace Service; 1/2" Size; Wcb Body & Spring Chamber; S40t Trim: 316SST Cylinder,316SST Plug With Tfe Seat,Fluorocarbon;Elastomer Diaphragm; Opt-30: 600 Lb Raised Face Flanges; 15-40 PSId Range Spring; Special Construction Per Ma Drawing 32911;