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Stemco · Brakes & Wheel End
343-4370
In stock · ships from Knoxville
This is a Stemco PSI™ oil hub cap designed for heavy-duty truck and trailer wheel ends.
Confirm the part fits before you buy. Applications and interchange numbers are researched and audited per part.
Verified fitment for 6 applications
Add your truck to see whether it's one of them
All confirmed applications for this part number.
Freightliner
Kenworth
Peterbilt
Western Star
Other applications
Freightliner
Kenworth
Peterbilt
Western Star
Other applications
Fits oil-bath hubs with 5-1/2" bolt circle, 6-bolt pattern, and 5/16" bolts. Commonly found on heavy-duty truck steer, drive, and trailer axles from the listed makes. Always verify hub dimensions before ordering.
Part data verified against 5 catalog sources
Numbers this part supersedes or interchanges with. Showing 1 of 1.
Different year, make, or config? Get a confirmation against your truck in under a minute.
It has a built-in sight window with fill lines and a side fill plug, making it easy to check and maintain oil level. The six vent holes allow pressure equalization while keeping dirt and water out, which helps protect wheel bearings and extend their life. Replace it when the window is cracked, the cap is damaged, or you are upgrading to a vented system.
Part Number: 343-4370
PSI HUB CAP
Unit: ea
Dealer: Knox Trailers
Compatibility, alternatives, and more
Parts commonly needed alongside brakes & wheel end
