Listings Mud Pumps National Oilwell A-1100-PT Single Acting Triplex Mud Pump – Used By admin 9 years ago National Oilwell A-1100-PT Single Acting Triplex Mud Pump S/N# P199A-56 Continue Reading Previous 13-5/8” 10M Shaffer Type SL Single & Double Ram BOPS – UsedNext National Oilwell 10-P-130 Single Acting 1300HP Triplex Mud Pumps – Used