RDS Fuel Tank Cap
Representative Photo, actual item may vary
Representative Photo, actual item may vary
Representative Photo, actual item may vary
Representative Photo, actual item may vary
Representative Photo, actual item may vary
RDS Fuel Tank Caps: Purpose-Built Protection for Auxiliary & Transfer Tank Systems
When you invest in a quality auxiliary or transfer fuel tank, the cap that seals it matters just as much as the tank itself. RDS Manufacturing — a brand with deep roots in the fuel storage industry — extends that same commitment to quality into their fuel tank caps, offering locking replacement caps engineered specifically to work hand-in-hand with their own tank lineup.
A Brand Built Around Fuel Integrity
Established in 1975 in Oklahoma, RDS Manufacturing Inc. is an award-winning company that produces top-quality marine and automotive tanks, toolboxes, and other aluminum products. A trusted leader with decades of expertise in crafting premium aluminum auxiliary, refueling, transfer, and marine fuel tanks, RDS products are designed for durability and versatility across trucks, boats, and commercial applications. That heritage of precision manufacturing carries directly into every accessory they produce — including their fuel tank caps.
What Makes RDS Fuel Tank Caps Stand Out
The RDS Lockable Replacement Fuel Cap is designed to fit any RDS product with a screw-type fill, and its lockable design helps protect against siphoning. This is a critical feature for anyone running an auxiliary or transfer tank in a truck bed, where fuel security is a real-world concern on job sites, farms, or remote work locations.
The universal fuel tank cap (model 011537) by RDS is a locking black plastic fuel tank cap that comes with 2 keys. Having two keys included is a practical touch — it means you're not left stranded if one goes missing during a long haul or a busy work week.
RDS's Lockable Replacement Fuel Cap (model 13690) is designed to fit any RDS tank with a screw-type fill cap and is compatible with both gas and diesel tanks. This cross-fuel compatibility makes it a reliable single solution for mixed-fleet operations, where one truck may run gasoline and another diesel.
The Ecosystem Advantage
One of the strongest reasons to choose an RDS fuel tank cap is ecosystem compatibility. RDS replacement parts are designed to connect seamlessly to RDS auxiliary or RDS transfer diesel fuel tanks, automatically controlling fuel levels going into your OEM tank — and they work with RDS auxiliary fuel tanks, RDS transfer fuel tanks, and RDS fuel tank/toolbox combos. Choosing the OEM-matched cap eliminates guesswork around thread sizing and seal integrity, which matters when you're dealing with flammable liquids far from a dealership or parts store.
Like all RDS Manufacturing products, their tanks — and the caps meant to seal them — are part of an aluminum-first philosophy, where rust resistance protects your fuel from contamination. A properly seated, locking RDS cap is the final line of defense in that contamination-prevention chain.
Who Needs an RDS Fuel Tank Cap?
- Truck owners running RDS auxiliary or transfer tanks who need a secure, siphon-resistant replacement cap
- Fleet operators managing vehicles that use both gasoline and diesel, thanks to the cross-fuel compatible design
- Off-road and agricultural users who need dependable fuel security in remote environments
- Anyone upgrading an existing RDS tank system and wanting OEM-matched components for a perfect fit
Browse the full selection of fuel tank caps or explore everything RDS Manufacturing has to offer across their complete line of fuel storage and transfer solutions.