These Earl’s caps are CNC-machined from 6061-T6 billet aluminum and anodized a bright black to ensure durability and good looks for years to come. The caps are available with either a 5.343″ 12-bolt flange, or a 4.438″ 6-bolt flange. Both feature a large 3″ opening with an easy to grip screw on cap that utilizes an o-ring seal. Stainless steel hardware is included for an easy installation.
For custom applications, Earl’s also offers billet filler cap kits so you can put a filler cap or inspection plug anywhere you need it. These are available in three styles: a bolt-on kit , an aluminum weldable bung kit, and a steel weldable bung kit. All three feature an easy to grip screw-on cap and o-ring seal.
The individual product text and high-resolution images can be found at the corresponding pages: