Model SLR-2 Rev A Pressure Reducing Regulator With Non-Relieving Loader; 1-1/2" Line Size, OPT-81: Full Diaphragm Support; Carbon Steel Body, Carbon Steel Loading Chamber; P1 17-4PH Stainless Steel Trim, 316L Stainless Steel Cage, Polyurethane Seat, Neoprene Diaphragm, BUNA-N Static Seal, BUNA-N O-Ring Dynamic Seal; OPT-34: ASME 600 Raised Face Flanged End Connections (14" Face - Face); Lower Spring 2-5 PSIG Range; Internal Sensing; Loader Configuration: 1/4" NPT, Stainless Steel Body And Spring Chamber, Non-Relieving, Stainless Steel Trim, PTFE Seat, 50 - 1250 psig Spring Range; No Filters (Customer To Supply), Stainless Steel Tubing, Stainless Steel Fittings