Model DA2 Rev E Differential Pressure Reducing Regulator; 1/2" Line Size; Sales Kit A; Carbon Steel Body With Carbon Steel Spring Chamber, 1/8" Petcock Vent; PG 17-4PH Stainless Steel Trim, 316L Stainless Steel Cage, GF-TFE Seat, Gylon 3-Ply Diaphragm, RTFE Static Seal, Piston Ring Assembly And GF-TFE Wiper Dynamic Seal;