Spinner KustomTech brass solder plug: affordable luxury for builders
Building a custom tank and want a killer cap? This polished billet brass Spinner-style weld-on cap from KustomTech combines the versatility of a weld-on system with the unmistakable elegance of the Spinner profile. A premium piece that transforms any handcrafted tank into a rolling jewel.
The best of both worlds
This cap combines two major advantages: a universal weld-on system that fits all custom steel tanks, and the Spinner design with its distinctive billet brass fins. While screw-on Spinner caps are limited to tanks with standard threads, this weld-on version opens up a world of possibilities for all custom projects.
Brass banknote: nobility and character
Brass is a unique material in the custom world. Its natural golden hue, its ability to be polished to a mirror finish, and its elegant patina that develops over time make it the preferred choice of the most discerning builders. This KustomTech cap showcases all these qualities with impeccable CNC machining that highlights every curve of the Spinner profile.
Installation and compatibility
The supplied raw steel tube can be welded onto any steel tank, whether it's a gasoline or oil tank. Once the tube is welded and the weld bead ground, the Spinner cap screws on smoothly. The result is a clean, professional finish that doesn't betray its DIY nature. Only the final result matters, and it's magnificent.
Technical characteristics
Material: CNC machined billet brass. Finish: Mirror polished. Profile: Spinner fins. Weld-on tube: Raw steel included. Compatible with: All steel gasoline and oil tanks. Part number: 10-010. Made in Italy by KustomTech.
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Technical specifications — KustomTech polished billet brass Spinner-style weld-on cap for gasoline and oil tanks
- Brand: KustomTech (Italy)
- Material: Brass
- finish: Poli
- Manufacturing: CNC machining from solid stock (Italian workshop)
- Official distributor in France: Holdfast Marseille
- Shipping time: 48 hours from Marseille
Compatibility of Harley Davidson fuel and oil caps
Compatible with all Harley Davidson models: Sportster 883/1200 (1991+), Dyna, Softail, Touring (Road King, Street Glide). For Touring models with a lock or Tour Pak, please check the exact model on the product page.
Installation
Direct plug: unscrew the old cap, screw in the KustomTech. For weld-on caps, a mini welder on the tank is required (typically 30-45 minutes at a specialist).
FAQ — Fuel and oil caps
Is it waterproof?
Yes. High-density nitrile rubber O-ring + precision machined threads = not a leak. E10 fuel and 4-stroke engine oil resistance tested.
Is the thread compatible?
Standard Harley Davidson thread (left-hand thread for the fuel cap on most models). Check the exact model on the product page before ordering.
Difference between screw-on and weld-on?
The screw-on cap = 30-second installation, plug-and-play. The weld-on cap = total customization, requires welding on a custom tank (chopper bobber).
Why buy from Holdfast Marseille?
- Official distributor of KustomTech France since 2019
- Permanent stock in Marseille, 48-hour shipping within mainland France
- Free delivery on orders over €150
- Responsive customer service from Marseille (no returns from Italy)
- KustomTech 2-year warranty
- Expert biker advice: call +33 6 45 57 84 26
Laurent C. –
Superb piece; the brass spinner profile gives it a truly incredible look. The weld tube is well-sized. I welded it with TIG and after a quick pass with a grinder, the result is invisible. Very professional.
François M. –
The most beautiful cap in my KustomTech collection. The brass Spinner solder cap is the absolute best for builders. I installed it on a Wassell tank and the result is amazing. The finish is superior to anything I've seen elsewhere.
OldSchoolBiker –
This is the third KustomTech item I've bought, and I'm just as satisfied as before. This brass solderable spinner cap is exactly what you need for a custom, handmade tank. Impeccable quality.
Marco T. –
Also, the CNC lavorazione is perfect. It can easily be used to store your batteries in the acciaio. The Spinner style is bright and beautiful.