Model DA8 Rev E Differential Back Pressure Regulator; 1" Line Size; Sales Kit A; Carbon Steel Body With Carbon Steel Spring Chamber, 1/8" NPT Petcock Vent; SL 316L Stainless Steel Trim, GF-TFE Seat, Fluorocarbon Diaphragm, Fluorocarbon Static Seal, PTFE Cap Seal With Fluorocarbon Energizer Dynamic Seal