The Fuelbox Lockable Gas Cap works best for the outside filler neck to keep your fuel locked & secure.
The Lockable Gas Cap fits the following Fuelbox products:
- FTC43
- FTC44
- FTC55
- FTC58
- FTC70
- FTC80
Fuelbox Lockable Gas Cap — Filler Neck Fuel Security
Secure Your Fuel with a Vetted Lockable Gas Cap
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$24.99
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Free Returns 30-day hassle-free returns.
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Ships in 3–5 Days Heavy-duty crating included.
4.9/5 Stars 2,400+ verified reviews.
In the box
- Fuelbox Lockable Gas Cap
- Keys
Secure Your Fuel with a Vetted Lockable Gas Cap
Protect your fuel supply with the Fuelbox Lockable Gas Cap. Designed specifically for the outside filler neck, this curated accessory keeps your diesel or gas secure against unauthorized access and theft. As a vetted component for Fuelbox transfer tanks, it delivers commercial-grade reliability where it matters most. Every unit is inspected to ensure it meets the straightforward demands of daily fleet operations. It ships free and integrates seamlessly with your existing setup, offering a simple, effective way to safeguard your investment on the job site.
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Lockable Fuel Security
Outside Filler Neck Fit
Fleet-Tested Reliability
Fits 6 Fuelbox Models
6
Compatible Fuelbox Tanks
MCG791
SKU Number
See product page
Weight & Dimensions
Fuel Theft Stopped at the Filler Neck
Fuel theft costs fleet operations thousands per year — and most standard gas caps offer zero resistance. The Fuelbox Lockable Gas Cap eliminates that vulnerability at the entry point. Its keyed locking mechanism attaches directly to the outside filler neck, so unauthorized users cannot access your fuel supply. This curated component turns a passive opening into an active barrier. No modifications, no guesswork — just a straightforward lock that does exactly what it should. Tank Vault selected this cap because it addresses a real threat with real craftsmanship, not marketing promises.
Precision Fit for Six Fuelbox Models
Compatibility guesswork leads to returns and downtime. The Fuelbox Lockable Gas Cap is engineered to fit six specific Fuelbox models: FTC43, FTC44, FTC55, FTC58, FTC70, and FTC80. Each of these units uses an outside filler neck design that accepts this cap directly, with no adapters or modifications required. When you run a fleet, you need parts that fit the first time — not after a third trip to the hardware store. This cap delivers that confidence. Tank Vault listed this product specifically because the manufacturer provides clear, verified fitment data for each model listed.
Straightforward Security That Respects Your Investment
Security doesn't require complexity. The Fuelbox Lockable Gas Cap uses a proven keyed lock design — no electronics, no batteries, no failure points. For fleet managers handling multiple fuel storage units, that simplicity matters. A cap that jams, sticks, or fails in the field creates frustration and delays refueling operations. This cap is built to last through daily use, exposure, and repeated locking cycles without degrading. At $24.99, it protects fuel inventory that costs significantly more to replace. Every product Tank Vault carries is tested to meet real-world standards, and this cap earns its place through reliable performance — not inflated claims.
Compatibility Guide
Verify your tank model before purchasing to ensure a proper seal and secure lock.
- Tank model is FTC43, FTC44, FTC55, FTC58, FTC70, or FTC80
- Filler neck is located on the outside of the tank
- Filler neck threading matches standard Fuelbox cap specifications
Applications
A straightforward upgrade for fleet managers looking to prevent fuel theft on the job site.
Construction Sites
Commercial Fleets
Fuel Transfer Operations
Full specifications
At a glance
- Dimensions
- See product page
- Surface
- See product page
Full specifications5 data points across 4 categories
Dimensions
| Exact Dimensions | See product page |
|---|
Power & Performance
| Performance Metrics | See product page |
|---|
Materials
| Material Construction | See product page |
|---|
Compliance & Warranty
| SKU | MCG791 |
|---|---|
| Category | Lockable Gas Cap |
The Tank Vault Promise
Every product we carry is vetted to meet the demands of real-world fleet operations.
Vetted QualityWe only stock products that meet strict build and performance standards.
Ships FreeUnconditional free shipping on every order, with no minimums or hidden fees.
30-Day ReturnsIf it doesn't fit your operation, send it back hassle-free within 30 days.
★★★★★
“We run three FTC70 units on our property and kept finding fuel levels dropping overnight. Slapped these lockable caps on all three — problem solved. Simple, no-nonsense fix that should have been standard from the start.”
Frequently Asked Questions
All grills ship fully assembled in heavy-duty crating. Just remove the packaging, add propane or charcoal, and cook. No tools required.
We offer free 30-day returns on all grills. If you're not completely satisfied with your purchase, contact us and we'll arrange a free pickup.
Yes — 0% interest financing is available on eligible purchases. Split into 4, 6, or 12 monthly payments with no hidden fees.
Yes. We carry a full catalog of OEM replacement parts including grates, burners, igniters, and heat shields for every brand we carry.
Absolutely. Our grills are built for all-weather use. The 304 stainless steel construction is designed to handle temperature extremes from -20°F winters to 110°F summers.
The Tank Vault Promise
Every product we carry is vetted to meet the demands of real-world fleet operations.
Vetted Quality
We only stock products that meet strict build and performance standards.
Ships Free
Unconditional free shipping on every order, with no minimums or hidden fees.
30-Day Returns
If it doesn't fit your operation, send it back hassle-free within 30 days.
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About the fuelbox Lockable Gas Cap
the fuelbox is a trusted manufacturer of premium lockable gas cap. TankVault is an authorized dealer offering the full the fuelbox lineup with free delivery, price match guarantee, and expert support.
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