BILLET FILL CAP- Aluminum Weld Bung Looking for an alternative to your stock fuel cell cap or maybe you need a fill cap for that custom oil tank or valve cover you are building? Well, look no further! Earls has created a full line of Billet Fuel Cell Caps and Billet Fill Caps. Earls caps are CNC machined from 6061-T6 billet aluminum and they feature a bright black anodize for great looks and corrosion protection. Each cap features a laser etched Earls logo so you know it is quality product. Earls Billet Fill Cap kits allow you to put a fill cap or inspection plug anywhere it is needed. EAR166018 features an aluminum weld bung. All kits feature an easy to grip screw on cap with O-ring seal and a 1.38 diameter opening. Features: Kit allows for installation of a fill cap or inspection plug anywhere needed Features aluminum weld bung Easy to grip screw on cap with o-ring seal 1.38'' diameter openingEarl's Billet Fill Cap-Aluminum Weld Bung 166018 at low everyday prices. Be sure to check out all of our products from Earl's Performance Products including Earl's Performance Products Aluminum Weld-In Bungs w/ Cap.