+3 CAT Fuel Filter Adapter O-Ring Kit (1 of each) for 6.6l Duramax KB-CAT-ORINGS $10.95 In stock Quantity: 1 Add to Bag Product Details O-Ring kit for the KBDP 2001-2016 Chevy/GMC 6.6l Duramax CAT Fuel Filter Adapter. Rest assured with a back up O-Ring kit in the glove box. Kit Includes: 1 - O-Ring for the top outer seal of the adapter 1 - O-Ring for the top center seal of the adapter 1 - O-Ring for the lower inner side seal Note: CAT Adapter not included - Pictured for fitment reference This O-Ring kit will work with all KBDP Duramax/CAT filter adapters. We cannot guarantee they will fit other brands of CAT adapters. Save this product for later Favorite