The OTR Water Pump for Detroit Diesel D13/D15 ensures Expertise Built In™ with its design to deliver safety and reliability, while boosting your truck engine's temperature maintenance. This heavy duty water pump undergoes extensive testing to ensure it meets or exceeds OEM performance, including: hub shaft force testing to 1,800 ft-lbs, bearings housing force testing to 1,500 ft-lbs, and impeller/shaft press fit torque testing to 200 in-lbs. In addition, the core and surface are Rockwell hardness tested, and careful leak testing serves to ensure 100% leak-free protection. We take engine overheating seriously; with OTR water pump replacements boasting hardware including OE specified bearings, unitized seals, high quality gaskets, and accessories to ensure proper fit, form, and function The OTR water pump is made for the most demanding, heavy duty engine cooling needs. FleetPride is your First Click in Heavy Duty®.