MODEL "POSR-1" PILOT OPERATED PRESS REDUCING REG,GRAPHITE/NBR GASKETS 1" SIZE; MAIN VALVE-DUCTILE IRON BODY & LOAD CHAMBER,PILOT VALVE-DUCTILE IRON BODY & CAST IRON SPRING CHAMBER; S2 HARD TRIM: MAIN VALVE-416SST PLUG, PILOT VALVE-416SST,302SST DIAPHRAGM; NPT SCREWED; 10-40 PSIG RANGE SPRING; PER SPQ NUMBER 50743 W/ SPECIAL PILOT MOUNTING;