Model "DA8" SALES KIT FOR PRODUCT CODE: D86-ASP7-81C5F000D; Differential Back Pressure Regulator (Series VIII)-PDBPV; Body Size 1",Standard Diaphragm Construction; Cf3m Body,316l SST Spring Chamber,1/8" SST Petcock Vent; S Trim: 316l SST Trim With V-Tfe Seat / Gasket,Fluorocarbon;Elastomer(Hk)(0.050 In.)Diaphragm; V-Tfe U-Cup Static Seal W/SST Energizer,V-Tfe U-Cup Dynamic;Seal W/SST Energizer;