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HAULK DEPOT

Plastic Oil/Grease Cap – For 6K–8K Hubs | HD
SKU: 8PL-GO-CPHD
$17.00 USD $17.00 USD $25.00 USD
Sale 32.0% $8.00 USD (32.0%)
Shipping calculated at checkout.
In stock
Description

This plastic oil/grease cap is designed for threaded oil bath hubs rated from 6,000 to 8,000 lbs. With a 2-7/8" outer thread diameter, it offers wide compatibility across Dexter and other trailer hub systems, including older 9K axles. The cap is ideal for maintaining proper lubrication in oil bath configurations and includes a rubber plug and O-ring for a complete installation.

Detailed Information:
Thread Diameter 2.875" (2-7/8")
Material High-Density Plastic
Axle Rating 6,000–8,000 lbs (also fits some 9,000 lbs)
Fitting:

Compatible with Dexter drums such as 8-219, 8-232, 8-285, and 8-286. Replaces Dexter oil caps #23-29 and #21-35. Also fits certain 9K axles manufactured before October 1, 1989. Designed for screw-in installation on oil bath hubs with 2.875" threads.

Features:
  • Wide Compatibility: Fits a range of Dexter and other hub models for 6K–8K axle systems.
  • Lightweight and Durable: Constructed from tough plastic to withstand exposure to oil, heat, and road debris.
  • Complete Setup: Includes rubber plug and O-ring for a secure, leak-resistant seal.
  • Easy Maintenance: Rubber access port allows convenient lubrication checks and refills.
Interchangeable Part Numbers:
  • OC-86580-268
  • 8-219
  • 8-232
  • 8-285
  • 8-286
Product Overview:

This 2.875" threaded plastic grease/oil cap is a reliable replacement solution for Dexter-style oil bath hubs. Whether you're maintaining a 6K, 7K, 8K, or pre-1989 9K axle, this cap ensures proper sealing and lubrication to extend the life of your hub components.

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.
Plastic Oil/Grease Cap – For 6K–8K Hubs | HD

Customer Reviews

Based on 12 reviews
83%
(10)
17%
(2)
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W
Willem Matteau
Flawless Installation

Took less than a minute to screw on. No leaks, no fuss. The rubber plug is easy to remove for checking the oil level. A great product.

J
Jose Ramirez
Exactly what I needed

My old cap was cracked and this was a perfect replacement. The threading was clean and it sealed well with the included O-ring. A solid purchase.

A
Avery Scatchard
Fits a 9K Axle Like a Glove

Needed a cap for an older 9K axle on my trailer. This one fit perfectly and the seal is tight. Great to find a compatible part.

R
Ronnie Jeffes
Excellent Value and Function

This cap works just as well as the brand name ones but at a better price. The rubber plug feels very secure. I'd definitely buy again.

H
Harry Jones
Good Product, Secure Seal

I was worried about the plastic threads holding up, but this cap feels very secure. No leaks after a few hundred miles. The price is also very reasonable.

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