Custom

Small vented aluminum gas cap with classic knurls and a polished top. It comes with a weld-in steel bung, so it can be used for DIY gas tanks, the modification of stock or custom tanks and oil tanks.

Viewed from the side these gas caps sit snugly on the gas tank, hence the name. The knurled edge makes them easy to operate, even with gloves on.

Screw-in, right-threaded gas caps with RSD logo badge.

The smallest gas caps on the market for H-D  fuel tanks. The designer must have had some very good experiences the night before because the locking mechanism of these caps is brilliant. When closed, the caps sit nearly flush on the tank for an absolutely clean look. To open, just a slight push and twist movement is necessary and a knurled disc pops up to unscrew the cap.

The smallest gas caps on the market for H-D  fuel tanks. The designer must have had some very good experiences the night before because the locking mechanism of these caps is brilliant. When closed, the caps sit nearly flush on the tank for an absolutely clean look. To open, just a slight push and twist movement is necessary and a knurled disc pops up to unscrew the cap.
Screw-in caps work with all tanks 1982-up.

These screw-in Pop-up gas caps by Tolle feature a wide collar for a more substantial look. All other features correspond to the screw-in Mini Pop-up gas caps.

Add a little race style to your 1983→ Harley-Davidson motorcycle with one of these filler caps, inspired by vintage aviation gas caps. With FUEL touted across the cap, they look right at home on cafe racers and scramblers as well as on any performance motorcycle. They feature a ratcheting mechanism, which allows you to tighten the cap and then rotate the design in line with your bike.

Flush-mount gas caps with or without bungs. The sets consist of one vented and one non-vented cap with keys. Designed for Stretched Fat Bob gas tanks, but the system also works on other tanks.

These slick, flush-mount gas caps combine the high-tech look of aviation style fuel fillers with a built in trim ring which protects the painted surface around the filler opening from damages and gas stains. A keyed entry system permits their ultra thin profile and prevents unauthorized gas refilling. Installation is thinkable easy and requires no cutting. The outer ring fits into the original filler thread with the actual filler cap screwed into a thread in the outer ring. They are available for all tanks with screw-in style filler openings, vented and non-vented, for Fat Bob style tanks and other tanks with a flat surface surrounding the filler hole.

Beautiful, nostalgic gas caps which sport a design that derives from the fifties and sixties. They are made of aluminum and feature racy snap-lock lids. Installation requires additional adapter bungs which are available as screw-in versions for 1983-up gas tanks or as steel weld-in bungs for custom applications.

Aircraft style gas caps allow perfectly flush installation for that undisturbed, low profile look if motorcycle is viewed from the side. The lock ring can be screwed to the tank surface with the supplied screws and lock nuts or by means of mounting ring kits which replace the nuts. These have to be ordered separately. Using the weld-in bungs you achieve the same look as with our ”Quick-Cam” tanks. Aero cas caps are of non-vented style. For proper tank ventilation a separate valve is required.

A royal crown for your bike! This gas cap is machined from billet aluminum and polished. It comes with a steel weld-in bung and a vent fitting.

Steel gas tanks can achieve the distinctive Old School appearance with one of these kits. They consist of a weld-in bung and a matching screw-in gas cap.

Reproduction of a 60es' Brit bike gas cap to fit our Lowbrow P-Nut gas tanks. Will not fit Harley tanks.