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(888) 312-8812 Login SignupPressure inside the engine builds gradually as combustion gases move past piston rings, and the Paccar Crankcase Breather Hose provides a route for those gases to exit. Without ventilation, pressure can affect seals and push oil outward through weak points. This hose directs blow-by gases away from the crankcase to help keep internal pressure balanced. Flexibility allows routing around engine components without restricting flow. The Paccar 1815954 serves as the outlet path for crankcase ventilation.
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