Model "2171" SALES B KIT FOR PRODUCT CODE: LB3-AS17-11000000B; Back Pressure Relief Regulator, Tfe Gasket/O-Ring; 3/8" Size, Angle Design (Two Side Inlets - Bottom Outlet); 316l SST Body & Cf3m SST Spring Chamber; S1 Trim: 316l SST Metal Seat,302SST Diaphragm;