Replace the failed water pump on your GM 6.6 LB7/LLY Duramax with a XDP X-TRA Cool Water Pump (Pump Only). The X-TRA Cool Water Pump is manufactured to meet the same specifications as the OEM pump. The direct-fit design ensures that this component fits on your engine just like the original for a perfect fit and function and a new set of seals makes for a smooth installation. This is the pump only and does not include the housing.Features: Direct-Fit DesignIncludes New SealsOE-Style ReplacementHigh-Quality Construction2 Year/Unlimited MileageSpecs: Housing Material: AluminumHub Height: 2.515 InchImpeller Material: Grey IronImpeller Rotation: StandardImpeller Vane Quantity: 8Mounting Hole Quantity: 6Notes: The harmonic balancer bolt will need to be removed to replace your water pump.The factory bolt is a torque-to-yield fastener (TTY) for one time use and must be replaced.