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When installing this filter housing outdoors in the cold the O-ring inside the primer pump may freeze very stiff and easily leak. It is recommended to heat the primer pump before installation to soften the internal O-ring. Boiling water can be used for heating or placed next to the heater for baking and heating. The installation is very simple and can be operated by novices.The filter assembly is suitable for Chevrolet 6.6L Duramax diesel 2500 HD 3500 HD pickup truck from 2005 to 2012. A brand-new filter housing designed by an American mechanic with heating function detachable inside and a brand-new tightness test ensures that the filter housing sent to you will not leak. Please note that its fuel inlet connector is downward so as to ensure that this product is suitable for your pickup truck. Our after-sales service will definitely satisfy you. br Please note that when installing this filter housing in cold weather the O-ring inside the prime pump may freeze very stiff. It is recommended to install it indoors and heat the “prime pump” to soften the O-ring to ensure no leakage