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HAULK DEPOT®

Aluminum Oil/Grease Cap – For 9K–10K GD Hubs | HD
SKU: 10AL-GO-CP-HD
$42.00 USD $42.00 USD $57.00 USD
Sale 26.32% $15.00 USD (26.32%)
Shipping calculated at checkout.
In stock
Description

This heavy-duty aluminum hub cap is designed for 9,000–10,000 lb General Duty (GD) axle systems and supports both grease and oil bath configurations. Crafted from corrosion-resistant aluminum alloy, it features a magnetic vent plug, integrated oil level sight window, and convenient drain/fill ports. The complete kit ensures a direct-fit replacement for Dexter and Valcrum assemblies.

Detailed Information:
Material Aluminum Alloy
Axle Rating 9,000–10,000 lbs (General Duty)
Application Grease & Oil Bath Axle Systems
Oil Level Window Yes
Vent Plug Magnetic
Ports Drain/Fill Ports Included
Fitting:

Compatible with Dexter 9K–10K GD axles and Valcrum-style hubs. Replaces factory aluminum hub caps for oil bath systems, providing enhanced sealing, fluid management, and debris protection. Easy to install with included plug, gasket, O-ring, and hardware.

Features:
  • Precision-Machined Aluminum: Engineered for durability and corrosion resistance in demanding environments.
  • Oil Level Sight Glass: Clear viewing window makes fluid checks simple without disassembly.
  • Magnetic Vent Plug: Captures metal particles to reduce axle wear and extend service life.
  • Accessible Ports: Built-in drain and fill access simplifies ongoing maintenance.
  • All-In-One Kit: Includes seals, plug, vent, O-ring, and mounting hardware.
Interchangeable Part Numbers:
  • K21-302-00
  • K71-704-00
  • 021-088-00
  • K21-257-00
  • ST-350-AM
Product Overview:

This premium aluminum grease/oil cap kit is a robust upgrade for Dexter and Valcrum 9K–10K General Duty axle hubs. With enhanced oil visibility, magnetic filtration, and complete installation components, it offers advanced protection and extended performance for high-capacity trailer systems.

We want you to be completely satisfied with your purchase. That’s why we offer a hassle-free return policy within 30 days of delivery*. If your item is unused, in original packaging, and eligible for return, you can send it back for a refund or exchange.

*Some exclusions may apply

Some of our products are backed by a 1-year limited manufacturer warranty covering defects in materials and workmanship under normal use. If you experience any issues during this period, we’ll work with you to repair, replace, or resolve it according to warranty terms.*

*Proof of purchase required

Need it fast? We’ve got you covered. Orders confirmed before 3 PM Eastern Standard Time (Monday–Friday) are processed and shipped out the same business day. Orders placed after the cutoff will ship the next business day.
Aluminum Oil/Grease Cap – For 9K–10K GD Hubs | HD

Customer Reviews

Based on 12 reviews
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(11)
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F
Ferd Ximenez
Great for grease or oil bath

I use my trailer for both long hauls and short trips, and I love the versatility of being able to use either grease or an oil bath with this cap. It's holding up well.

G
Goddart Lonergan
Sight Window Is a Game Changer

Finally, I can check my oil levels without having to pull the cap off. This feature alone is worth the purchase. The cap itself is very well-made and feels solid.

D
Demott Morit
Solid, No-Leak Performance

I installed this on my boat trailer to handle saltwater exposure. The corrosion-resistant aluminum is exactly what I needed. No leaks so far, and the sight glass hasn't fogged up.

M
Marshall Durtnel
Perfect Fit for My Dexter 10K

I was skeptical about finding a good aftermarket cap, but this one fit my Dexter 10K hub perfectly. The included gasket and O-ring made for a solid, leak-free seal. The sight glass is a huge plus for quick checks.

C
Clarance Henkens
Minor Cosmetic Flaw, But a Solid Cap

The cap had a tiny surface scuff, but it's purely cosmetic. The function is perfect. The ports are well-machined and the sight glass is very clear.

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