What This Hose Does
This is the upper inlet leg between the engine outlet and the radiator on International ProStar and 9200 trucks running the ISX. It is a molded hose, not a straight cut length. The 45-degree bend is formed into the rubber so the hose clears surrounding hardware and holds its shape under vacuum on cooldown.
Inside diameter is 2.5 inches. That is the number that matters when you are matching it against what came off the truck. Measure the neck on the radiator inlet and the engine side outlet, not the hose itself — a swollen hose measures larger than it was built.
Because the bend is molded, a straight hose forced into the same path is not a substitute. Forcing the bend collapses the inner wall, restricts flow, and puts a constant side load on both necks. That load works the clamps loose and cracks plastic radiator tanks over time.
Why These Numbers Cross
2025806C2 is the International number carried on the truck's parts list. F02520S352 is the aftermarket number covering the same hose. Both describe a molded 45-degree inlet hose at 2.5-inch ID for the same ProStar and 9200 ISX application, which is why they show up against each other in interchange listings.
Cross-references on molded hose come down to three things: inside diameter, bend angle, and leg lengths. When those match, the hose seats the same way on both necks and the clamps land in the same place. Different numbers from different sellers are the same physical part described in different catalogs.
Numbers listed here are for identification only. PartStop is not affiliated with, endorsed by, or authorised by International or any other manufacturer. Use the cross-reference as a starting point, then confirm by VIN or by reading the number stamped or printed on the hose you are pulling off.
Checks Before You Order
Squeeze the old hose cold. If it feels spongy near the ends, or the layers separate under your thumb, it is done regardless of how it looks. Also check for a hard, glazed section — that is heat damage and it cracks next. Pull the clamps and look at the neck for pitting or a groove worn into it.
Pull the old hose and compare it side by side to the replacement before you fill the system. Check both leg lengths and the angle. If your truck has been repaired before, someone may have fitted a hose that was close but not right, and the old part will not tell you what the truck actually needs.
Replace the clamps while you are in there. Constant-tension clamps that have been heat-cycled for years lose the spring that keeps them tight through cold starts. New hose on tired clamps weeps at the first hard cooldown.
2025806C2 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to 2025806C2. 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 |
|---|---|
| Fleetpride/Aftermarket | F02520S352 |
Frequently asked questions
Will 2025806C2 fit my ProStar with the ISX?
The cross-reference covers International ProStar and 9200 applications with the ISX, but fitment is not promised on the number alone. These trucks were built in several cooling package configurations. Confirm by VIN or by matching the number and shape on the hose you remove.
Can I use a straight 2.5-inch hose instead of the molded one?
No. The 45-degree bend is molded in so the hose holds the routing without stress. A straight hose bent into that path kinks the inner wall, restricts coolant flow, and pushes sideways on the radiator neck. That side load cracks tanks and works clamps loose.
Is this the same as the part that came on the truck?
This is an aftermarket, premium quality direct replacement, not an original-equipment product. It is built to the same 2.5-inch ID and 45-degree molded configuration described by the reference numbers. It carries a PartStop 6+ month warranty.
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
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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.