1 1
HAULK DEPOT

Plastic Oil/Grease Cap – For 6K–8K Hubs
SKU: 8PL-GO-CP
$23.00 USD $23.00 USD $29.00 USD
Sale 20.69% $6.00 USD (20.69%)
Shipping calculated at checkout.
In stock
Description

This complete oil/grease cap kit is engineered for 6,000–8,000 lb Dexter-style trailer hubs with 2.875" screw-in threads. It also fits select 9,000 lb Dexter axles manufactured before October 1989. Designed for oil bath applications, the kit includes all essential components for a full replacement, ensuring reliable performance and a leak-resistant seal.

Detailed Information:
Thread Diameter 2.875" (2-7/8")
Thread Count 12 Threads
Material Plastic + Rubber Components
Axle Rating 6,000–8,000 lbs (also fits select 9K)
Fitting:

Designed for Dexter 6K and 8K threaded oil bath hubs, and compatible with 9K axles manufactured before October 1989. Direct replacement for Dexter® 021-029-00 and related caps. Ideal for maintaining proper lubrication and protecting internal hub components.

Features:
  • Complete Kit: Includes (2) thread-in oil caps, (2) rubber plugs, and (2) O-rings for a full replacement solution.
  • Reliable Performance: High-quality materials offer long service life under demanding road conditions.
  • OEM Compatibility: Matches Dexter specifications for direct replacement and proper sealing.
  • Effortless Installation: Threaded design allows for quick and secure assembly without special tools.
Interchangeable Part Numbers:
  • K71-038-00
  • 021-029-00
  • 27-373
  • 21-35 KIT
  • 21-35-KIT
Product Overview:

This plastic grease/oil cap kit is tailored for Dexter-style screw-in oil bath hubs rated for 6K–8K axles. With full component coverage and reliable sealing, it provides an effective solution for maintaining oil bath systems and preventing lubricant loss or contamination.

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

Customer Reviews

Based on 12 reviews
92%
(11)
8%
(1)
0%
(0)
0%
(0)
0%
(0)
O
Orran Peartree
Fits my old 9K Dexter axle!

Finding parts for my older trailer is a pain. I was skeptical, but these fit my pre-1989 9k Dexter axle perfectly. The threaded design is secure, and I'm happy with the purchase.

E
Emlyn Keune
Perfect Fit for My 7K Axle

Was looking for a direct replacement for my Dexter axle. These threaded right on, and the included O-rings created a perfect seal. No leaks after a few hundred miles.

S
Sherlock Turpin
Arrived on time and well-packaged

The kit was well-packaged and arrived without any damage. The caps are good quality and fit my 8k Dexter axle as advertised.

C
Chaddy Mahaddy
Minor Cosmetic Flaw, Perfect Function

One of the caps had a small scratch on the plastic, but it was just cosmetic. The fit and seal are flawless, and they're doing their job perfectly.

S
Sander Fullick
Exactly What I Needed

My old caps were leaking. Swapped them out with these, and the problem is solved. The kit is complete and the parts are high quality.

123
11.gif

SIGN UP FOR OUR NEWSLETTER!

Learn about our products, weekly sales, discount codes and much more
logo5.png