Description
Flex Technologies CAC40P-350X6 is a 4-ply silicone cold-side charge air cooler hose, 3.5″ inside diameter by 6″ long, for the post-intercooler section of turbocharged heavy-duty diesel boost piping. Polyester reinforcement, 0.16″ wall thickness, rated -65°F to +350°F, ozone- and oil-splash-resistant, and built to Mil-Spec A-A-52426. Sold as a single straight boot.
Signs You Need a New Charge Air Cooler Hose
- Visible cracks, splits, or dry-rotted rubber on the hose surface
- Soft, spongy, or delaminated feel when flexed by hand
- Oil residue, soot, or wetness around the clamp ends after a hard pull
- Loss of boost, slow throttle response, or noticeable power drop under load
- Audible hiss or whoosh from the boost piping during acceleration
- Boost-pressure or MAP-related fault codes lighting the dash
- Hose collapsing inward under high boost or kinking when the engine moves on its mounts
Specifications
| Manufacturer | Flex Technologies |
|---|---|
| Part Number | CAC40P-350X6 |
| Part Type | Cold Side Charge Air Cooler Hose (straight) |
| Inside Diameter | 3.5 in (89 mm) |
| Length | 6 in (152 mm) |
| Construction | 4-ply silicone |
| Reinforcement | Polyester |
| Wall Thickness | 0.16 in (4 mm) |
| Temperature Range | -65°F to +350°F (-54°C to +177°C) |
| Specification | Mil-Spec A-A-52426 |
| Resistance | Ozone- and oil-splash-resistant |
Applications
This 3.5″ cold-side charge air boot fits any turbocharged heavy-duty diesel installation that uses a 3.5″ ID x 6″ straight section on the cold (post-intercooler) side of the boost piping. Common applications include:
- Freightliner Cascadia, Columbia, Century (select boost-piping positions)
- Kenworth T680, T880, W900, T800 (select boost-piping positions)
- Peterbilt 579, 389, 388, 387 (select boost-piping positions)
- International ProStar, LT, LoneStar (select boost-piping positions)
- Volvo VNL, VNR (select boost-piping positions)
- Mack Anthem, Pinnacle, Granite (select boost-piping positions)
Measure the failed boot before ordering — charge-air piping varies position-to-position on the same truck, and a 3.5″ ID hose will not seal a 3″ or 4″ tube.
Related Sizes
Cold side (CAC40P series):
- CAC40P-300X6 – 3″ x 6″
- CAC40P-400X6 – 4″ x 6″
- CAC40P-400X8 – 4″ x 8″
- CAC40P-450X6 – 4.5″ x 6″
Hot side (CAC40 series):
- CAC40-350X6 – 3.5″ x 6″
- CAC40-400X6 – 4″ x 6″
- CAC40-400X8 – 4″ x 8″
- CAC40-450X6 – 4.5″ x 6″
Measure existing hose inside diameter and length before ordering. Confirm clamp size matches the 0.16″ wall thickness.
