The XDP Fuel Filter Adapter, Bleeder Screw & Spacer with CAT 1R-0750 Filter is an easy way to change the fuel filter on your 2001-2016 GM 6.6L Duramax. The durable anodized filter adapter simply threads on to the OEM Filter Head and allows you run the Advanced High Efficiency CAT Filter on your truck. For an even easier filter change, a filter head spacer is included to give you more clearance for filter changes, along with an aluminum bleeder screw to replace the factory supplied plastic version that is commonly damaged during routine maintenance. Features: Thread On Adapter - Uses Stock Filter HeadUses Advanced High Efficiency CAT 1R-0750 FilterNo Modifications To Factory Fuel System NeededKit Contents: CAT 1R-0750 FilterFuel Filter Head SpacerXDP Aluminum Air Bleeder ScrewAnodized Filter Adapter with O-RingsAll Required Hardware for Installation