Mark Williams billet aluminum 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 ixternal threads.

Features

• Made in the USA
• Machined from 6061 aluminum
• Knurled grip 
• Internal Threads
• Oring seal
• Gold Anodized

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

Mates to the Mark Williams steel weld bung: Click Here