XDP Duramax CAT Adapter with 1R-0750 Filter, Bleeder Screw The XDP Duramax CAT Adapter with 1R-0750 Filter, Bleeder Screw & Spacer XD171 is an easy way to upgrade the fuel filter on your 2001-2015 GM 6 Duramax. The durable anodized filter adapter simply threads on to the OEM Filter Head and allows you run the more efficient and less expensive CAT Filter on your truck.5/5(10) Amazon: cat fuel filter adapter for duramax Nicktane Duramax CAT Fuel Filter Adapter With Filter. 3.9 out of 5 stars 14. $89 $ 89. 00. FREE Shipping. CAT Fuel Filter Upgrade Adaptor for GM Duramax - Designed and Manufactured in the USA. 3.0 out of 5 stars 6. $79 $ 79. 99. Get it as soon as Wed, May 1. FREE Shipping by Amazon.