This 3D model is a copy of triplex mud pump TPK 2200 from Aker / Wirth.
* Available in STEP format.
* Some more renders here: High Pressure Mud Pump (toon render)
"A mud pump is a reciprocating piston/plunger device designed to circulate drilling fluid under high pressure down the drill string and back up the annulus." (Wikipedia).
More offshore drilling equipment renders can be found here: