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DEXTER

Service Kit – For Fortress Bolt-On Oil Cap – For 9K–12K Hubs | DXT
SKU: AL-CP-REPKIT
$37.00 USD $37.00 USD
Shipping calculated at checkout.
In stock
Description

This complete service kit is designed for maintaining and restoring Dexter Fortress Bolt-On aluminum oil caps used on 9,000–12,000 lb axles. Whether you're replacing worn components or performing preventive maintenance, this OEM-compatible kit includes all essential hardware for resealing and securing your cap assembly.

Detailed Information:
Axle Rating 9,000–12,000 lbs
Application Service Kit for Fortress Bolt-On Cap
Compatible Cap Dexter 021-259-00 / K21-259-00
Mount Style Bolt-On
Fitting:

Specifically engineered for Dexter Fortress bolt-on aluminum oil caps used on 9K–12K medium-duty trailer axles. Direct replacement for all wear components on the K21-259-00 oil cap assembly. No modifications required for installation.

Features:
  • Complete Maintenance Kit: Includes gaskets, oil fill plugs, rubber logo plugs, and bolt/washer hardware.
  • Direct-Fit Replacements: Designed to match Dexter OEM specifications for a perfect fit.
  • Built for Service: All components are made from durable, heavy-duty materials.
  • Fast Installation: Everything you need to re-seal or rebuild your Fortress bolt-on cap in one kit.
Kit Contents (K71-187-00):
  • (2) Dexter Logo Rubber Plug – Part #085-029-00
  • (2) Oil Fill Plug – Part #007-695-00
  • (2) Bolt-On Oil Cap Gasket – Part #010-500-00
  • (12) Bolt/Lock Washers – Part #007-684-00
Interchangeable Part Numbers:
  • K71-187-00
Product Overview:

The Fortress Bolt-On Cap Service Kit is the go-to solution for maintaining Dexter aluminum oil caps on 9K–12K axles. Ideal for fleet service or in-field repairs, this kit ensures your cap remains sealed, secure, and ready for extended use in oil bath axle 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.
Service Kit – For Fortress Bolt-On Oil Cap – For 9K–12K Hubs | DXT

Customer Reviews

Based on 12 reviews
83%
(10)
17%
(2)
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(0)
0%
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M
Miles Pascow
Exactly What It Says on the Tin

Needed a new gasket and plugs for my 12k axle. This kit had it all. Simple, straightforward, and got the job done fast.

A
Alvan Gudgion
OEM Quality at a Great Price

Every piece in this kit felt like genuine Dexter quality. The rubber plugs are robust, and the new gasket sealed up tight. Way better than buying individual parts.

D
David Johnson
Fixed a Persistent Leak

Had a stubborn leak for months. Replaced the gasket and bolts with this kit, and the problem is gone. The fit and finish of the parts are excellent.

L
Lazare Dyte
Reliable, High-Quality Components

Used this kit to rebuild two Fortress caps. The gaskets and plugs are thick and durable. No leaks, no worries.

F
Floyd Penella
Rubber Plug Came Loose

The rubber plug on one of the new caps popped out after a day of use. I was able to re-seat it, but it was a bit of a hassle. The rest of the kit was fine.

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