Mark Williams billet aluminum fuel and oil cap allows you to add a fill system to your rear end housing, fuel tank, or other with the options to have a steel or aluminum weld bung. Featuring external threads.

Features

• Made in the USA
• Machined from 6061 aluminum
• Knurled grip 
• External Threads
• Oring seal
• Black Anodized

Note: Must add weld bung in options drop down otherwise replacement cap only will be shipped.

Anodized aluminum black fuel cap with laser engraving. Knurled grip surface with sealing o-ring included. Sold each. Mates to the M/W 5020 or 5040 weld bung.