Flex Technologies CAC40P-400X6 Cold Side Charge Air Cooler Boot – 4" ID x 6" Length

The Flex Technologies CAC40P-400X6 is a 4-ply polyester-reinforced silicone charge air cooler boot designed for cold side (post-intercooler) applications on heavy-duty diesel engines. With a 4" inside diameter and 6" length, this hose provides a flexible, durable connection between the charge air cooler and intake manifold. Engineered to meet Mil-Spec A-A-52426 and OEM heavy-duty vehicle requirements, it's built to withstand the demands of commercial trucking and off-highway applications.

Signs You Need a New Charge Air Cooler Boot

• Visible cracks, splits, or holes in the hose
• Boost pressure leaks causing reduced power and increased fuel consumption
• Soft or collapsed hose under boost pressure
• Oil-soaked or deteriorated hose material

Specifications

Additional Sizes

Hot Side (Aramid/Orange):

• CAC40-300X6 – 3" x 6"
• CAC40-350X6 – 3.5" x 6"
• CAC40-400X6 – 4" x 6"
• CAC40-400X8 – 4" x 8"
• CAC40-450X6 – 4.5" x 6"

Cold Side (Polyester/Blue):

• CAC40P-300X6 – 3" x 6"
• CAC40P-350X6 – 3.5" x 6"
• CAC40P-400X8 – 4" x 8"
• CAC40P-450X6 – 4.5" x 6"

Applications

This charge air cooler boot fits a variety of heavy-duty diesel applications including:

• Freightliner, Kenworth, Peterbilt, Volvo, Mack, International, and Western Star trucks
• School buses and transit buses
• Agricultural and construction equipment
• Marine and industrial diesel engines

Measure existing hose diameter and length to confirm fitment before ordering. Use T-bolt clamps rated for charge air cooler applications.