At a Glance

> Thread Check: Confirm 2.875"-12 thread before ordering.
> Application Check: Match the cap to the hub style, axle rating, and drum reference where applicable.
> Service Check: Inspect sealing surfaces during installation and replace worn sealing components as needed.
> Measure First: Confirm the 2.875" OD and 12-thread specification before ordering.
> Check the Hub: Inspect threads for cross-threading, damage, or corrosion before installing the new cap.
Brand: R & P Carriages
SKU: 21-35-BILLET-WRENCH-KITX2

Before You Order

Match the part number, measurements and connection points that apply to your trailer.

Part Number	Match the number stamped on the original bearing or seal.
Dimensions	Measure the mating surfaces when a number is unavailable.
Hub / Axle	Use capacity as context, not as the only fitment check.

Product Details

Oil Bath Hub Caps / Trailer Axle Service Kit

Two - Billet Aluminum Oil Bath Trailer Caps 2.875"-12 Thread with Wrench

Kit includes two billet aluminum oil bath caps and one matching wrench, designed for 2.875"-12 threaded hubs on Lippert and Dexter axle applications where measurements match. Fits Lippert and Dexter.

Part Number: 21-35-BILLET-WRENCH-KITX2 2.875"-12 Thread 2 Caps + 1 Wrench

Key Measurements & Specs

Specification	Detail
Part Number / SKU	21-35-BILLET-WRENCH-KITX2
Product Type	Billet aluminum oil bath cap kit with wrench
Thread Size	2.875" OD
Thread Count	12 thread
Material	Billet aluminum
Quantity Included	Two oil bath caps and one billet wrench

Fitment / Application

Category	Details
System	Oil bath trailer hub cap applications
Fits	Lippert & Dexter applications where 2.875"-12 thread matches
Axle Ratings	6000#, 7000#, 8000#, Pre-89 9K
Drum Reference	8-285
Fitment Method	Verify hub cap thread size, thread count, and cap style before ordering

Top Features

Feature	Buyer Benefit
Billet Aluminum Caps	Durable oil bath cap construction for trailer hub service
2.875"-12 Thread	Matches compatible threaded oil bath hub applications
Two-Cap Kit	Services both matching hubs when replacing a pair
Wrench Included	Includes matching billet wrench for installation and removal

Overview

This 21-35-BILLET-WRENCH-KITX2 kit includes two billet aluminum oil bath caps and one billet wrench. The caps are built for 2.875"-12 threaded oil bath hub applications and are listed for Lippert and Dexter fitment references in 6000#, 7000#, 8000#, and Pre-89 9K axle applications where the hub measurements match.

R&P Service Insight

Oil bath caps help seal the hub and retain lubricant. Correct thread fit and sealing condition are important for preventing leaks and maintaining bearing life in oil bath systems.

Thread Check: Confirm 2.875"-12 thread before ordering.
Application Check: Match the cap to the hub style, axle rating, and drum reference where applicable.
Service Check: Inspect sealing surfaces during installation and replace worn sealing components as needed.

R&P Knowledge Hub

Compatibility: Designed for compatible 2.875"-12 threaded oil bath hubs. Verify before ordering if your cap size, hub thread, or axle application differs.

Vehicle / System Fit: Oil bath trailer hub applications listed for Lippert and Dexter references, including 6000#, 7000#, 8000#, and Pre-89 9K axle applications where measurements match.

Installation Notes: Confirm thread size, thread count, hub condition, and cap seating before installation. Do not force mismatched threads.

Performance Insight: Oil bath caps retain lubricant inside the hub. Proper fitment helps protect bearings by reducing the risk of lubricant loss.

Brand & Fitment Note

Selling Brand: R&P Carriages curated kit

Application Reference: Lippert and Dexter names are used as compatibility references for matching oil bath hub applications.

What This Means: This listing is for a billet aluminum oil bath cap kit with wrench, not a guaranteed OEM-branded item unless specifically stated and verified.

Before Ordering: Verify thread size, thread count, axle rating, hub style, drum reference, and included components before installation.

R&P Repair Insight

Oil bath cap fitment should be confirmed by measurement, not only by axle brand. Similar-looking caps can use different thread sizes or cap styles.

Measure First: Confirm the 2.875" OD and 12-thread specification before ordering.
Check the Hub: Inspect threads for cross-threading, damage, or corrosion before installing the new cap.
Confirm Quantity: This kit includes two caps and one wrench.

Features

Billet Aluminum Construction

Durable billet aluminum oil bath caps for compatible trailer hub applications.

2.875"-12 Thread Specification

Designed for hubs using the listed 2.875" OD and 12-thread oil bath cap size.

Lippert & Dexter Application References

Listed for compatible Lippert and Dexter axle applications where measurements and hub style match.

Installation Wrench Included

Kit includes one billet wrench for installation and removal of the included caps.

Included Components

Part Number	Quantity	Item
21-35 Billet-Kit	2	Billet aluminum oil bath cap, 2.875"-12 thread
Billet-Wrench-2.25	1	Billet aluminum wrench for 2.25" caps

Important Fitment Note: Verify thread size, thread count, hub style, axle rating, drum reference, and included components before installation. Lippert and Dexter references describe application fitment only unless OEM status is specifically stated and verified.

View More 21-35 Oil Cap Options

21-35 billet oil cap kit with wrench 2.875-12 oil bath cap Lippert Dexter oil cap replacement trailer oil bath cap billet aluminum oil cap kit 6k 7k 8k hub cap wrench kit 21-35-BILLET-WRENCH-KITX2 8-285 drum reference Pre-89 9K oil bath hub cap

Two - Billet Aluminum Oil Bath Trailer Caps 2.875"-12 Thread with Wrench (21-35-BILLET-WRENCH-KITX2)