PacBrake PH+ PowerHalt Air Shut-Off Valve 17-20 GM L5P | 19-20 GM Cab & Chassis. Fits: 2017 - 2019 Chevy/GMC 6.6L L5P Duramax; 2020 - 2025 Chevy/GMC 6.6L L5P Duramax.