CheeMuii Trailer Hub Cap Kit 4-Pack 343-4009 Replacement — Aluminium Alloy, Oil-Window Caps with Spare Gaskets

These hub caps give you a durable, serviceable sealing solution for commercial trailer axles. Each cap is die-cast from aluminum alloy and polished for corrosion resistance, and includes a transparent oil window for quick visual inspection of hub oil. The kit ships with four hub caps plus four spare gaskets and plugs so you can install and service an axle set without hunting for replacement parts.

How does this hub cap kit make routine inspections faster?

The transparent oil windows let drivers and technicians see oil level and condition without removing the cap, which reduces downtime and simplifies checks during pre-trip inspections. Tight sealing gaskets and a leakproof-coated side plug preserve oil integrity while the clear port keeps monitoring straightforward.

• High-strength clear plastic oil window for instant visual checks
• Tight-sealing gasket around the oil window to prevent contamination
• Side pipe plug coated with leak-proof glue to stop seepage
• Includes spare gaskets and plugs for quick replacement

Are these caps compatible with my existing axle hardware?

This set is engineered as a direct replacement for Stemco 343-4009 and matches the bolt pattern and critical dimensions of many OEM variants. The kit fits hubs with 5-1/2" bolt hole spacing and 5/16" bolts and matches common replacement numbers from major manufacturers.

• Bolt hole spacing: 5-1/2" and bolt size: 5/16"
• Height: 2-11/16" and inside depth: 1-15/16"
• Flange outer diameter: 6-1/4" and inner diameter: 4-3/8"
• Cross-references: Stemco 343-4009, Eaton 821338/821907, Triseal 64009, National 343-009

What materials and features help prevent leaks and wear?

The caps are die-cast in aluminum alloy, polished to stand up to road exposure and resist corrosion. Sealing is reinforced with a gasket surrounding the oil window, and the side pipe plug receives a leak-proof coating to minimize the chance of seepage at common failure points.

• Aluminum-alloy die-cast housing for strength and corrosion resistance
• Polished surface treatment for long-term durability
• Gasket-sealed oil window to keep contaminants out
• Glue-coated side plug to reduce oil leakage risk

What comes in the box and which replacements are included?

The package contains four CheeMuii hub caps ready for axle installation, plus an extra set of four gaskets and four plugs so you can replace wear parts immediately. The set is intended for fleets and owners who want a complete repair solution without sourcing multiple components separately.

• 4 hub caps with pre-installed gaskets and plugs
• 4 extra gaskets and 4 spare plugs for maintenance
• Compatibility list includes GMC/Volvo numbers and popular axle manufacturer references
• Ready for direct fitment where Stemco 343-4009 and listed cross-references are used

Who is this for: fleet maintainers, service shops and owner-operators needing a reliable, inspection-friendly hub cap replacement. If you run commercial trailers that use Stemco 343-4009 or equivalent hub specs and want caps that simplify oil checks while offering leak-resistant seals and spare parts in the box, this kit is built for those needs.