One-Piece EGR Coolant Bypass Tube for Cummins ISX / ISX15 / X15 / QSX Engines

Replaces Part Numbers: 4367122, 5575183

Upgrade your cooling system with this premium one-piece coolant bypass tube designed for Cummins ISX and QSX series engines. This tube replaces the factory two-piece assembly, providing a stronger, leak-resistant solution for both on-road and off-road applications.

Product Features

• Direct Replacement for OEM 4367122 & 5575183

• One-Piece Design – eliminates extra joints and potential leak points

• Improved Durability – stronger construction compared to factory two-piece setup

• Reliable Coolant Flow – transfers coolant from the water pump to the back of the block

• Designed for ISX / QSX Platforms – including CM871, CM2250, CM2350, and X15 engines

• Ideal for Marine & Industrial Engines – many marine applications do not use EGR systems, making the bypass tube crucial for proper cooling

Why Upgrade to a One-Piece Tube?

Factory designs use multiple connections that commonly wear out, causing:
✔ Leaks
✔ O-ring failures
✔ Costly downtime

This one-piece tube eliminates those weak points and offers easier installation and long-term reliability.

Applications

Compatible with:

• Cummins ISX

• Cummins ISX15

• Cummins X15

• Cummins QSX / QSX15

• Industrial, off-road, and marine engines using CM871, CM2250, CM2350, X15 platforms

Perfect for trucks, generators, heavy equipment, and marine engines where consistent cooling flow is critical.

Built for Harsh Environments

Marine and industrial engines run under heavy load and in corrosive conditions. This upgraded one-piece design ensures stable coolant delivery even in environments where EGR components are not used.