Are you in need of a way to access the pressurized intake air system on your Cummins for use with a boost gauge without drilling and tapping your intake manifold? This adapter has a hole drilled through it that allows you to remove one of the bolts that affixes the air intake plenum to the cylinder head. Remove the bolt, replace it with the Boost Adapter, torque to 12 ft. lbs. and you now have access to pressurized air. Works with all boost tubing kits that thread in an 1/8in. NPT fitting.