Fleece Performance Cummins Cylinder Head Dowels Fleece Performance Engine Coolant Bypass|Heating & Cooling The coolant that flows through

The coolant that flows through the tube provides heat to the heater core for the in-cab AC/Heat system

The kit includes 3 new square cut O-rings and 1 new standard O-ring as well as 2 new O-rings for each of AN fittings

Does not include Fitting

increased horsepower and torque

Fleece Performance Cummins Cylinder Head Dowels Fleece Performance Engine Coolant Bypass|Heating & Cooling The coolant that flows throughReplacement cylinder head dowels for use between the engine block and cylinder head. Kit includes 2 dowels. Application Notes: Replaces Cummins part number 3902343. Fits 1989 2023 Cummins 12 valve and 5. 9 6. 7L 24 valve engines.