REPAIR KIT FOR O RING # 936 FOR CIRCULATION PUMP P-, 521A/ B, DRG NO IJ016/ PE/ N- 0012/ R1. SEAL TYPE: HPS D20, Q3, SEAL MECHANICAL FOR AMMONIA CIRCULATION PUMP, P- 521 A/ B. SEAL TYPE HPS D 20/ HPS D24 AS PER DRAWING, NO., THROTTLE BUSH ASSEMBLY PART NO 4 FOR, CIRCULATION PUMP P- 521 A/ B. DRAWIN G NO. R3C, E464/ A/ R0/ A. VENDOR: M