Drilling Mud Pump parts: Pinion, Bull Gear 1)equivalent to API Standard; 2)forged,high hardness alloy ... Mud pumps used in today's Oilfield equipment field.Bull gear & Pinions Characteristics:1)equivalent to API Standard;2)forged,high ... best price asap.Welcome to our manufactory to visit ! Bull gear, Pinion gear, Mud Pump Part