What This Hose Actually Is
This is a coiled or straight air hose assembly used in the brake system on heavy trucks and trailers — the kind that runs from the tractor to the trailer glad hands, or feeds a component in the air system that needs flexible line instead of rigid tubing. F01778S115 is the supplier part number; 30-2151 is the number most guys know it by.
These get replaced for one of three reasons: the hose is cracking or checking from age and UV exposure, it's chafed through from rubbing on a frame rail, or it's just leaking air at a fitting that's corroded past saving. Either way, once one goes, you're looking at an air loss that'll trip your low-air warning or worse.
Why All These Numbers Point to the Same Hose
302171, 169127, 169157, and PE13000 all cross-reference to this same air hose because different manufacturers have packaged and stamped the identical (or functionally identical) part under their own numbering over the years. This happens a lot with air hose — the physical hose, fittings, and length are standardized enough across brands that one supplier's part slots into another's box.
What you want to watch: hose length, fitting thread size, and whether it's a straight hose or coiled. Air hoses aren't one-size-fits-all just because the part numbers cross — a coiled 15-footer and a straight 3-footer aren't interchangeable even if some database lists them together. Check the old hose's tag or measure it yourself before you order.
If your old part doesn't have a legible number on it anymore, go by VIN and pull up what the truck came with, or measure the hose length and fitting size and call us. We'd rather answer a question up front than send you a return.
Ordering From PartStop
We're in Tacoma and keep a run of these air hoses in stock — if you're local, you can usually get one same-day. If you're not local, we ship nationwide and most orders move fast enough that you're not sitting on a grounded truck longer than you have to.
This is an aftermarket hose, not an original-equipment part, and we tell you that straight up. It carries our 6+ month warranty. Confirm fitment against your old part's number or your VIN before you check out — that's on us to remind you and on you to double-check, because a five-minute look now beats a shipping label back later.
30-2151 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to 30-2151. 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 |
|---|---|
| OE/Cross-Ref | 302171, 169127, 169157, PE13000, 451097 |
| Supplier P/N | F01778S115 |
Frequently asked questions
Does 302171 fit my truck?
Probably, if your old hose was stamped 302171 or one of the other cross numbers we list — but 'probably' isn't good enough for a brake system. Measure the length and check the fitting threads against what you're pulling off, or give us the VIN and we'll check it against factory specs before you order.
Is this the same as the 169127 hose?
They cross-reference to the same physical part, yes — same length, same fitting configuration in most cases. But 'crosses to' means it's a match on the interchange list, not a guarantee for your specific application. Compare the old hose or the number on it before assuming it's a drop-in.
Will this stop my trailer from losing air at the glad hand?
If the leak is coming from a cracked or chafed hose, yes, replacing it should fix that. If the leak's at the glad hand seal itself or further up in the valve, this hose won't touch that problem. Trace the leak first — soap and water on the fittings will show you exactly where it's coming from.
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.