The 21-40 Screw-In Oil Cap is a high-quality, threaded cap designed specifically for Dexter 6,000 lb and 7,000 lb 5-spoke axles equipped with oil bath hubs. Crafted from durable clear Lexan plastic, this cap allows for easy visual inspection of oil levels without the need for removal, ensuring optimal maintenance and performance of your trailer's axle system.

Key Features

• Clear Lexan Construction: Provides visibility to monitor oil levels effortlessly.

• Screw-In Design: Ensures a secure fit, preventing leaks and contamination.

• Compatibility: Fits Dexter 6K–7K 5-spoke axles with oil bath hubs.

• OEM Replacement: Replaces Dexter part number 21-40.

Specifications

• Product Number: 21-40

• Outer Diameter: 2.563 inches

• Thread Size: 2 5/8"-12

• Material: Clear Lexan plastic

• Includes: Oil cap only (O-ring and rubber plug sold separately)