Model DA4 Rev E Pressure Loaded Reducing Regulator; 1" Line Size, OPT-81: Full Diaphragm Support Construction; Stainless Steel Body With Stainless Steel Loading Chamber; PG 17-4PH Stainless Steel Trim, 316L Stainless Steel Cage, GF-TFE Seat, Gylon 3-Ply Diaphragm, RTFE Static Seal, Piston Ring Assembly And Wiper Dynamic Seal; NPT End Connections; Lower Spring 2-5 PSIG Range; External Sensing With Loading Configuration