What This Hose Is and Where It Lives
This is a silicone CAC hump hose, 4 inch ID by 6 inch length, with two stainless steel reinforcing rings molded into the wall. The hump shape lets it absorb movement and misalignment between the intercooler outlet and the intake piping - straight silicone sleeves don't flex that way and end up stressed at the clamps until they split.
It's on the hot side of the charge air system, meaning it's downstream of the turbo before the air hits the CAC, or between the CAC and the intake depending on how the truck is piped - so it sees real heat along with boost pressure. That's why silicone with steel ring reinforcement instead of straight rubber; plain rubber hoses in this spot cook and go soft, then you get a boost leak that shows up as a power complaint or a check engine light for low boost.
Common on Freightliner Cascadia and Columbia, International ProStar and 9200 series, and Kenworth T660/T680 chassis with the CAC routing that uses a 4 inch hump connector at this location. Engine and chassis combo matters here, so don't just match by truck badge.
Cross-Reference Numbers - What Lines Up and What to Check
D10298699 is the number this part carries under Freightliner/Navistar/Kenworth parts systems depending on which OEM channel you're pulling from - Navistar's own catalog lists it as 3558834C2, and Flexfab (who actually manufactures a lot of these silicone couplers for the truck OEMs) has it as F02485S352 or FLX7723HSE. HPS sells a similar hose as HE8699. These all cross because they're built to the same ID, length, and hump profile - not because someone just slapped a different label on the box.
Where guys get burned on hump hoses: length and ID look right but the hump position is off-center, or the ring spacing doesn't match your existing clamp locations. A half inch difference in overall length can mean the hose won't reach both pipe ends without stretching the silicone thin at one clamp. If your old hose is cracked and you can't measure the hump position anymore, check the flat sections on either side of the hump - they should be roughly even unless your application specifically uses an offset hump.
Rule of thumb: pull the old hose, measure ID at both ends, overall length, and hump center position, then match against these numbers or bring the old part to the counter. VIN lookup helps narrow down the engine platform but this is a piping-location part, not a VIN-locked part number, so physical comparison is what actually confirms fit.
Ordering from PartStop
We keep this hump hose in stock at the Tacoma counter for same-day pickup, and we ship nationwide if you're not local. At $36.99 it's cheap insurance compared to a roadside call for a boost leak that shuts down a loaded truck.
Comes with our 6+ month warranty. If it doesn't match up to your old part or the numbers on your CAC piping, call us before you cut the old hose out - easier to sort a return before it's covered in coolant residue and turbo grease.
D10298699 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to D10298699. Use them to identify the part — then confirm the exact fit by VIN or the number stamped on your old unit before you order. An interchange is a starting point, not a fitment guarantee.
| Brand / Line | Cross-Reference Numbers |
|---|---|
| Flexfab | F02485S352, FLX7723HSE |
| Navistar | 3558834C2 |
| HPS | HE8699 |
Frequently asked questions
Does F02485S352 fit my International ProStar?
Likely, if your ProStar uses a 4 inch ID hot-side hump hose at that CAC connection point - but confirm by measuring your old hose's ID, length, and hump position, or check the number stamped on it against F02485S352. Engine and radiator package changes the routing on some ProStar builds, so don't assume by year alone.
Is D10298699 the same as the Flexfab FLX7723HSE?
They cross to the same hose - same ID, length, and hump design - because Flexfab manufactures this style of coupler for multiple truck OEM parts catalogs. The physical part is the same regardless of which box number is printed on it, but always compare the actual dimensions against what came off your truck before ordering.
How do I know if I need a hump hose here instead of a straight coupler?
If the factory hose in this location has a curve or bulge in the middle rather than being a straight tube, you need the hump version - it's there to handle misalignment between the CAC and intake piping. Installing a straight coupler in a hump hose location usually means it's stretched or kinked at one end, which shortens its life fast.
Not sure it fits? We check before you pay.
Run your VIN and we’ll match parts to your exact truck, or call the counter — a person who knows trucks verifies fitment by OEM number before the order ships. No wrong-box returns.
More cross-reference guides
Need the part, not just the reading?
Every part below is a Premium Quality aftermarket Direct Replacement with published OEM cross-reference numbers, a 6+ month warranty and same-business-day shipping from Tacoma, WA. Not sure it fits? Run your VIN — or call and a person who knows trucks will verify fitment before you pay.