CheeMuii 4-Pack Hub Cap Window Cover Kit for Stemco 343-4009 – 4 Oil Windows, Gaskets & Vent Plugs

CheeMuii 4Pack 359-5995 Hub Cap Window Cover Kit is a complete replacement kit of oil windows, rubber vent plugs, gaskets and bolts engineered to fit Stemco 343-4009 style semi truck and trailer hub caps.

If you maintain heavy-duty trailers or tractor axles, this CheeMuii kit gives you visible oil windows and OEM-compatible seals so you can inspect hub oil quickly and replace worn components without buying full new hub caps. Parts are manufactured to match OEM dimensions for Stemco/GMC/Volvo-compatible hub caps and include extra gaskets and bolts for a complete service session.

How does the oil window help me check hub oil condition?

The clear plastic oil windows let you visually confirm oil level and color at a glance, saving time during routine inspections. Built with high-strength transparent plastic, they resist crazing and provide a tight seal with included ring gaskets to reduce leakage risk.

• Transparent window O.D. is 3-1/2" for a broad viewing area
• Center hole I.D. is 1-1/8" to match common hub openings
• High-strength plastic resists cracking under road vibration
• Window ring gaskets (8 included) ensure a reliable seal

Will this kit prevent hubcap leaks and pressure build-up?

Yes — the kit contains precision-molded rubber vent plugs and multiple gaskets designed to meet OEM sealing standards. Plugs include a vent hole to relieve trapped pressure while gaskets provide smooth, bubble-free sealing surfaces to minimize oil seepage.

• 4 rubber vent plugs with vent holes for pressure regulation
• 4 hub cap gaskets to replace worn seals around the cap face
• 8 window ring gaskets to stop oil migration around the viewing window
• Manufactured to OEM dimensions to ensure compatibility and sealing

What exactly is included and what sizes should I verify?

The CheeMuii 359-5995 kit ships with all parts needed for four hub caps and extra fasteners so you can complete a full axle service. Confirm the listed dimensions and bolt patterns against your hub cap model before ordering to ensure fit.

• Kit contents: 4 oil windows, 4 rubber vent plugs, 8 window ring gaskets, 4 hub cap gaskets, 25 bolts
• Important dimensions: plastic window O.D. 3-1/2", center hole I.D. 1-1/8"
• Gasket hole pitch: white gasket 3-7/8" on center; hub cap gasket pitch 5-1/2" on center
• Check compatibility with Stemco 343-4009, GMC/Volvo, Spicer-Dana listings

Who this kit replaces: the plastic windows and plugs substitute Stemco 359-5990 components, and the hub cap gaskets match Stemco 330-3009. The assembly fits popular hub caps such as Stemco 343-4009, GMC/Volvo models 921010009 and 862500, and many Strick, Timpte, Trailmobile, and Spicer-Dana caps.

Who is this for: fleet mechanics, owner-operators and maintenance shops that service semi-trailer and truck axles will find this CheeMuii four-pack useful for scheduled maintenance and quick roadside repairs. It’s best for anyone who needs a full replacement kit with visible inspection windows, OEM-alike gaskets and a supply of bolts for four hub caps — check measurements against your hub cap before purchase to ensure a correct fit.