Fortress Aluminum Oil Cap Replacement Complete Kit, For Dexter 9K-10KGD Axles

Replaces the oil cap, O-ring, and plug for these Dexter caps
Dexter: K71-704-99, 021-088-00, or K21-257-00
Application: 9,000-lb to 10,000-lb axles
Overall diameter: 3.5"