Coolant Bypass Tube - Water Pump to Thermostat Housing 2011-2016 GM 6.6L Duramax LML Pacific Performance Engineering - 119000830 2023-chevrolet-silverado-1500-esi9579600 outer ring and counterweights)

outer ring and counterweights)

The pump outlet and return is threaded to accept a -8 O-ring fitting (3/4 inch-16 thread)

6L Duramax LBZ|LMM (119020200)

D-701-36) Remove your crushed oval-shaped stock down-pipe and replace it with a smooth

Coolant Bypass Tube - Water Pump to Thermostat Housing 2011-2016 GM 6.6L Duramax LML Pacific Performance Engineering - 119000830 2023-chevrolet-silverado-1500-esi9579600 outer ring and counterweights)The OEM mild steel tube is prone to rust, which can lead to coolant system contamination and eventual leaks. Over time, factory O rings also tend to harden and lose compression, increasing the risk of failure. PPEs upgraded bypass tube is specifically designed to work with the factory water pump and is crafted from high grade 304 stainless to prevent corrosion and ensure reliable, long term performance. OEM PN for Reference: GM 12633704 Features: