Model D Rev C Pressure Reducing Regulator With Graphite/NBR Gaskets; 1/2" Size; Sales Kit A; Cf8m Body & Spring Chamber; S36 Trim: 316SST With Virgin Teflon (V-Tfe) Seat,302SST Diaphragm; 30-80 PSIG Range Spring; Opt-56: Special Clean Per Spec #S-1542