The XDP X-TRA Cool Water Pump XD681 is a direct-fit replacement for the water pump in your Ram 6.7 diesel. This unit is manufactured to meet the original specification as the factory component and provides you with a factory fit and function. If shopping based on OEM cross reference numbers, there are many water pumps that cover the 6.7L engines. This pump has the 82mm iron impeller which is an upgrade over the plastic impeller originally equipped on most models.Features: Drop-In ReplacementIncludes Mounting O-Ring2 Year/Unlimited MileageSpecs: Housing Material: IronHub Height: 3.877 InchImpeller Material: IronImpeller Rotation: ReverseImpeller Vane Quantity: 7Mounting Hole Quantity: 2Pulley Diameter: 82mm