Model DA5 Back Pressure Regulator (Series V)-BPV, Sales Kit A For Product Code: D59-ASS7-W4X51805B; Body Size 2", Stnadard Diaphgram Construction; CF3M Body, 316L Stainless Steel Spring Chamber; 316L Stainless Steel Plug/Cage/Piston, 1-Ply Fluorocarbon Elastomer (HK) (@0.050 In.) And 1-Ply TFE Diaphragm, Virgin TFE Seat And Cage Gasket; Virgin TFE Static Seals, TFE U-Cup With Stainless Steel Energizer Dynamic Seal; 150# RF Flanged End Connections; Per Cashco Drawing Number 51805 - With 10-30 PSIG Range Spring; Internal Sensing, No Lower Spring; Reverse Flow Direction; Parts Hydrogen Peroxide Cleaned