What This Hose Is and Where It Goes
This is a 2.5" ID silicone coolant hose, 8.875" long, with five molded convolutions (the 'rings') that let it flex and absorb vibration without kinking. That ring design shows up a lot on Peterbilt 389/567/579 and Kenworth T680/T880 applications between the radiator and engine or on charge air / coolant crossover routing, depending on the truck.
F50-6308 and F506308 are the same number written two ways - Peterbilt's system drops the dash sometimes depending on where it's printed on the parts list or invoice. 28359 is Gates' number for what is functionally the same hose. None of that means every 2.5" silicone hose with rings in it is interchangeable - length, ring spacing, and ID all have to match or it won't seat right on the necks.
Silicone construction is the point here. These hoses run in a hot spot near the engine or turbo, and rubber hoses in that location harden and crack a lot faster than silicone does. That's why the factory spec'd silicone instead of standard EPDM.
Reading the Cross-Reference - What to Check Before You Order
Gates 28359, Continental 57140, and Dayco 70051 all cross to this same hose profile - same ID, same length, same ring count. These are different manufacturers making the same design because Peterbilt and Kenworth used the same hose engineering across multiple truck lines for years. That's normal in this industry and isn't anything to be suspicious about.
Where guys get burned is length and ring count. There are similar-looking 5-ring hoses out there that are 6 inches or 10 inches instead of 8.875", or 4-ring instead of 5-ring, made for a different chassis or engine spacing. Installing the wrong length means you're either stretching silicone tight enough to stress-crack it early or you've got slack that rubs on something.
Surest way to confirm: pull the old hose and measure ID and overall length yourself, or read the number off it if it's still legible. If you've got the truck's VIN, that'll narrow down which coolant hose kit applies too, since Pete and Kenworth both used several different radiator/engine combos across model years.
Ordering From PartStop
We keep this one in stock in Tacoma, so if you're local and your truck's parked, you can grab it same-day and be back on the road same shift. Ship nationwide too if you're not near us - goes out standard ground or expedited if you're down.
$59.99, backed by our 6+ month warranty. Confirm the ID, length, and ring count against your old hose or the number stamped on it before you order - we're glad to check specs over the phone if you want to read us the VIN or the old part number first.
F506308 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to F506308. 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 |
|---|---|
| Gates | 28359 |
| Continental AG | 57140 |
| Dayco | 70051 |
| Peterbilt | 389, 567, 579 |
| Kenworth | T680, T880 |
Frequently asked questions
Does F506308 fit my 2016 Kenworth T680?
Likely, but T680s ran a couple different cooling setups depending on engine and year. Give us the VIN or measure your old hose (2.5" ID, 8.875" length, 5 rings) and we'll confirm before you order.
Is this the same as Gates 28359?
Yes, Gates 28359 cross-references to this same hose - same ID, length, and ring pattern. Different label, same design.
Can I use this hose somewhere other than Pete/Kenworth if the size matches?
If the ID, length, and ring spacing match your old hose, it'll generally work regardless of chassis badge. Just confirm those three measurements against what you're pulling off - don't go by truck model alone.
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.