CAT® PLUNGER-RELI Top Seller Reduces emissions and supports compliance

Reduces emissions and supports compliance with EPA standards

Its precision fitment facilitates easy installation and maintenance

ensuring proper alignment and durability under high stress

structured crown with an adjustable snapback for a custom fit

CAT® PLUNGER-RELI Top Seller Reduces emissions and supports complianceThe CAT PLUNGER RELI is a critical component in the oil filter and oil cooler systems of many Caterpillar engines. It functions as a relief valve plunger that remains closed under normal conditions but opens when filters become clogged, allowing oil to bypass and maintain continuous engine lubrication. This prevents pressure buildup and protects engine components by ensuring consistent oil flow even during filter blockages.