Model "123-1+6+S" Diff Back Press Relief Regulator,Non-Nace Service; 1/2" Size,1/4" Reduced Orifice; Wcb Body & Spring Chamber; S40s Trim: 316SST Metal Seat,Fluorocarbon Elastomer (Fkm) Diaphragm; Opt-33: Three Npt Body Connections; 30-80 PSId Range Spring; Per Spq/Ma Drawing 32935