CheeMuii Trailer Hub Cap Kit 343-4009 — 2-Pack Aluminium with Oil Sight Window & Gaskets

CheeMuii 2 Pack 343-4009 Trailer Hub Caps Kit is a direct-fit aluminum hub cap replacement that includes gaskets and plugs and features a visible oil sight window for easy hub oil inspection.

If you maintain trailer axles or replace worn hubcaps, this CheeMuii kit gives you two fully equipped hub caps designed to match the Stemco 343-4009 form and fit. Each hub cap is die-cast from aluminum alloy with a polished finish, comes with sealing gaskets and coated plugs, and uses a clear, high-strength plastic oil window so you can visually check axle oil without removing the cap. The kit adds spare gaskets and plugs so you have parts on hand for routine service.

How will these hub caps help me monitor my axle oil?

The hub caps include a transparent oil sight window so you can instantly see oil level and condition inside the hub. This lets you spot low oil or contamination early, without disassembling components.

• High-strength clear plastic window for visual inspection
• Gasket-sealed oil view to prevent leaks while allowing observation
• Quick assessment of oil color and level during routine checks

What are the key physical specifications and included components?

This kit supplies two hub caps plus replacement gaskets and plugs to match common commercial axle dimensions. Dimensions and bolt patterns are provided so you can confirm compatibility before installation.

• Contents: 2 hub caps, 2 gaskets, 2 plugs, plus 2 extra gaskets and 2 extra plugs
• Bolt hole spacing: 5-1/2"; Bolt size: 5/16"
• Height 2-11/16", inside depth 1-15/16", flange outer Ø 6-1/4", flange inner Ø 4-3/8"

Which axle makes and part numbers does this replace?

CheeMuii designed this hub cap to be a compatible replacement for a wide set of industry part numbers. It fits Stemco 343-4009 and many equivalents used by OEMs and aftermarket suppliers.

• Direct replacement for Stemco 343-4009 (3434009)
• Cross-references: GMC/Volvo 921010009, 862500; National 343-009
• Also compatible with Spicer-Dana, Eaton, Triseal, Trailmobile, Timpte and other similar references listed

Are these hub caps built to resist leaks and wear?

Manufactured from die-cast aluminum and finished with surface polishing, the caps are engineered for corrosion resistance and dimensional stability. Sealing features reduce the risk of oil seepage around the sight window and side plug.

• Die-cast aluminum alloy construction with polished surface treatment
• Tightly sealed oil window with gasket to keep contaminants out
• Side pipe plug coated with leak-proof adhesive for extra protection

Who is this for: The CheeMuii 2 Pack 343-4009 Hub Caps Kit is aimed at fleet technicians, trailer owners, and mechanics who need a dependable, visible, and dimensionally compatible hub cap replacement for medium- and heavy-duty trailers. It’s suitable when you require spare gaskets and plugs on hand, a direct fit to Stemco 343-4009 equivalents, and a quick way to monitor hub oil during inspections without a teardown. Verify bolt pattern and flange dimensions before purchase to ensure proper fit for your axle application.