The XDP X-TRA Cool Water Pump (With Housing) XD666 is a high-quality replacement for the failed water pump on your GM 6.6 LB7/LLY Duramax engine. This Water Pump comes with the housing which is known to leak or erode due to cavitation and or corrosion in the cooling system. This is a direct-fit replacement that includes the necessary seals for a hassle-free installation. Each pump is manufactured to factory specifications giving you a factory fit and function.Features: Includes New SealsDirect-Fit ReplacementMeets OEM SpecificationsIncludes Water Pump and Housing2 Year/Unlimited MileageSpecs: Housing Material: AluminumHub Height: 2.515 InchImpeller Material: Grey IronImpeller Rotation: StandardImpeller Vane Quantity: 8Includes Back Housing: YesMounting Hole Quantity: 5Outlet Quantity: 3Notes: 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.