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DEXTER

Plastic Oil/Grease Cap – 4" Threaded Lexan – For 9K–15K Hubs | DXT
SKU: 1215-GO-CPDXT
$35.00 USD $35.00 USD $47.00 USD
Sale 25.53% $12.00 USD (25.53%)
Shipping calculated at checkout.
In stock
Description

This clear Lexan plastic oil/grease cap is a threaded replacement for Dexter 9K–15K axle hubs. With a 4.000" outer diameter and durable see-through construction, it allows for easy oil level inspection in oil bath systems. Designed for screw-in installation, it fits a wide range of Dexter heavy-duty and general-duty axles, including 9K (post-Oct. 1989), 10K, 12K, and 15K models.

Detailed Information:
Outer Diameter 4.000"
Material Clear Lexan Plastic
Thread Style Screw-In (Threaded)
Axle Rating 9,000–15,000 lbs
Fitting:

Fits Dexter 9K axles manufactured after October 1989, 10K general duty 2-piece hubs, and Dexter 10K HD to 15K oil bath hub assemblies. Uses O-ring #10-50 and oil cap plug #46-32 (sold separately).

Features:
  • Clear Lexan Body: Provides visual access to check oil level without removing the cap.
  • High Load Compatibility: Suitable for use on 9K, 10K, 12K, and 15K trailer axles.
  • Threaded Design: 4" screw-in style ensures a tight, leak-resistant seal.
  • OEM Fit: Direct replacement for Dexter 21-36 and 021-036 oil caps.
Interchangeable Part Numbers:
  • 21-36
  • 021-036
  • 021-036-00
  • 7700030
Product Overview:

This 4" OD clear Lexan threaded oil cap is a reliable replacement for Dexter heavy-duty axle hubs ranging from 9K to 15K. Built for durability and ease of inspection, it's a smart solution for fleets and trailers operating oil bath systems where visibility and performance matter.

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 – 4" Threaded Lexan – For 9K–15K Hubs | DXT

Customer Reviews

Based on 12 reviews
83%
(10)
17%
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T
Tobias Vice
Clear Design Makes Inspections Effortless

I run a fleet of equipment trailers—this cap cuts inspection time in half. Can see oil level without tools or disassembly. Brilliant upgrade.

J
Jacob Cleminson
Great for Preventative Maintenance

I mark the ideal oil line with a pen on the side. Now my crew checks it during pre-trip and tops off before issues arise. Smart design.

R
Radcliffe Leeson
Strong, Clear Plastic – No Clouding

After weeks of sun and road grime, the Lexan hasn’t yellowed or scratched. Easy to wipe clean and still see the oil level clearly.

T
Tucker Madre
Exact Replacement for Dexter 021-036

Ordered based on the part number and it’s a direct match. Clear body is sturdier than I expected—no clouding or cracking.

J
José Rodriguez
Game-Changer for Oil Bath Maintenance

Finaly no more guessing if my hubs are full. The clear Lexan lets me check oil levels in seconds—huge time saver on long hauls.

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