CheeMuii Trailer Hub Caps 2-Pack 343-4009 Replacement Aluminum with Oil Sight Window and Spare Gaskets

CheeMuii 2 Pack 343-4009 trailer hub caps kit replaces Stemco 343-4009 style hub covers, providing a sealed aluminum housing with a clear oil window and spare gaskets/plugs for maintenance-ready axle protection.

This two-piece hub cap kit is built for heavy-duty trailer and truck axles where reliable oil containment and easy visual checks matter. The caps are die-cast from aluminum alloy, polished for corrosion resistance, and fitted with sealing gaskets and coated plugs to reduce the chance of oil seepage. A transparent oil sight window lets you inspect lubricant level and condition without disassembly, and the package includes extras so you can swap seals quickly when servicing wheels.

How do these hub caps keep axle oil contained?

The caps use precision die-cast aluminum bodies with a sealing gasket around the oil window and a side plug treated with leak-resistant coating. Together they form a tight barrier against contaminants and fluid loss while withstanding road vibration and wheel heat.

• Aluminum alloy housing resists corrosion and holds shape under torque.
• Transparent, high-strength plastic sight window for leak-tight viewing.
• Gasket and coated side plug included to reduce seepage risk.
• Machined fit matches bolt pattern to ensure proper sealing.

What sizes and parts are included in the kit?

The kit ships with two hub caps plus spare gaskets and side plugs so you have service parts on hand. Dimensions and bolt pattern are specified to match common heavy-duty hubs that use the 343-4009 family of replacements.

• Includes: 2 hub caps, 2 gaskets, 2 side plugs, plus 2 extra gaskets and 2 extra plugs.
• Bolt hole spacing: 5-1/2"; Bolt size: 5/16".
• Cap height: 2-11/16"; Inside depth: 1-15/16"; Flange OD: 6-1/4"; Flange ID: 4-3/8".

Which vehicles and part numbers are these compatible with?

These CheeMuii caps are manufactured to replace Stemco 343-4009 and fit a wide range of OEM and aftermarket axle hubs. They are cross-referenced to many common suppliers so you can use them as a direct replacement for matching flange and bolt patterns.

• Direct replacement for Stemco 343-4009 / 3434009.
• Cross-references include GMC/Volvo, Spicer-Dana, Strick, Eaton, National, Triseal, Trailmobile, Timpte part families.
• Check flange dimensions and bolt pattern to confirm fit before installation.

How easy is installation and routine inspection?

Installation follows standard hub cap mounting: align the flange, tighten bolts to spec, and ensure the gasket seats evenly. The built-in transparent oil window shortens inspection time—just view the window rather than removing the cap to check lubricant level.

• Simple bolt-on replacement using existing bolt pattern and hardware.
• Visual oil inspection through high-strength clear window saves downtime.
• Extra gaskets and plugs included for fast on-truck servicing.
• Clean sealing surfaces before installation to ensure leak-free fit.

Who is this for: Professional fleets, owner-operators, trailer repair shops, and DIY mechanics who need a reliable, serviceable hub cap that simplifies oil checks and matches common heavy-duty replacement part numbers. If you maintain trailers or trucks that use the Stemco 343-4009 family, this CheeMuii kit supplies the caps, seals, and spare parts needed for quick maintenance and continued axle protection.