Model "DA4" SALES A KIT FOR PRODUCT CODE: D4P-5P87-80200000E; Pressure Loaded Reducing Regulator (Series IV)-PLPRV; Body Size 2",Opt-81: Full Diaphragm Support Construction; Carbon Steel Body & Carbon Steel Loading Chamber; 17-4ph SST Trim, 316l SST Cage, Gf-Tfe Seat, Fk Diaphragm;Fk Static Seal, SST/Tfe U-Cup Dynamic Seal