---
product_id: 4150870
title: "The Flow Security Systems VersaLock | Vented Locking Fuel Tank Cap | For Transfer & Above Ground Commercial Tanks | Prevents Theft & Secures Fuel Tanks | FSS 754 | Includes Adapter | 1CT"
brand: "flow security systems"
price: "¥14592"
currency: JPY
in_stock: true
reviews_count: 13
category: "Flow Security Systems"
url: https://www.desertcart.jp/products/4150870-the-flow-security-systems-versalock-vented-locking-fuel-tank-cap
store_origin: JP
region: Japan
---

# Patented free-spinning lock Pressure & vacuum valve at 1.5 lbs/oz Weatherproof self-closing latch The Flow Security Systems VersaLock | Vented Locking Fuel Tank Cap | For Transfer & Above Ground Commercial Tanks | Prevents Theft & Secures Fuel Tanks | FSS 754 | Includes Adapter | 1CT

**Brand:** flow security systems
**Price:** ¥14592
**Availability:** ✅ In Stock

## Summary

> 🔒 Lock in your fuel’s safety, unlock peace of mind.

## Quick Answers

- **What is this?** The Flow Security Systems VersaLock | Vented Locking Fuel Tank Cap | For Transfer & Above Ground Commercial Tanks | Prevents Theft & Secures Fuel Tanks | FSS 754 | Includes Adapter | 1CT by flow security systems
- **How much does it cost?** ¥14592 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/4150870-the-flow-security-systems-versalock-vented-locking-fuel-tank-cap)

## Best For

- flow security systems enthusiasts

## Why This Product

- Trusted flow security systems brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Customizable Security:** Choose keyed alike for streamlined access or keyed differently for maximum control across multiple tanks.
- • **All-Weather Durability:** Self-closing latch seals out dust, dirt, and moisture for reliable performance in any environment.
- • **Pressure Balanced Safety:** Built-in valves equalize pressure and vacuum, preventing fuel spillage and tank damage.
- • **Unbeatable Theft Deterrence:** Patented free-spinning design makes unauthorized removal virtually impossible.
- • **Universal Fit & Convenience:** Fits standard 2-inch male threads with included adapter for seamless installation on transfer and above-ground tanks.

## Overview

The Flow Security Systems VersaLock FSS-754 is a heavy-duty, vented locking fuel tank cap designed for transfer and above-ground commercial tanks. Featuring a patented free-spinning lock to prevent theft, a weatherproof self-closing latch, and built-in pressure/vacuum valves, it offers customizable keyed options and universal fit with included adapter. Engineered from hard non-ferrous alloy, it ensures secure, durable protection against tampering, siphoning, and environmental damage.

## Description

Buy The Flow Security Systems VersaLock | Vented Locking Fuel Tank Cap | For Transfer & Above Ground Commercial Tanks | Prevents Theft & Secures Fuel Tanks | FSS 754 | Includes Adapter | 1CT: Fuel Tank Caps - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Works great - Proper installation is critical. Instructions and worthless but common sense should be enough. The short end goes on the tank. The flange for tightening the 2” adapter is thin and smooth by design so a pipe wrench is required. A couple drops of loctite will help, too. When putting the cap back on, I found it helps to get it hand tight, and make sure there’s a little play before locking it. When unlocking the cap, you might have to wiggle the cap a little so the lock pin sets properly. One of the complaints I saw was about the cap spraying fuel - especially when the fuel is sloshing in the tank. My guess is that the tank was too full and/or didn’t have baffles. Transfer tanks should not be filled more than 90% of capacity. Works great!
Review: Locking fuel cap - It installed very easily, and I'm satisfied with the product. Just a little extra protection for my expensive heating oil.

## Features

- PREVENT UNAUTHORIZED USE: The Flow Security Systems PRE-VENT Fuel Cap is a quick and inexpensive way to safeguard costly fuel and oil from theft, tampering, siphoning and vandalism. The VersaLock utilizes our patented free spinning design and is perfect for all business owners who want to secure their transfer fuel tanks.
- MULTIPLE USE: The FFS-754 is designed for use on mobile fuel transfer tanks as well as above ground commercial gas and distillate tanks. The VersaLock has a weather proof self-closing latch covering the face of the lock to prevent dust, dirt, debris and moisture from entering the lock.
- KEYED DIFFERENTLY OR THE SAME: The VersaLock can be keyed alike so that multiple fuel caps can be secured with the convenience of having only one key. Perfect for those who have multiple transfer tanks and don't have to carry different keys for each tank. The VersaLock can also be keyed differently so that each fuel cap can have its own unique key providing added security for your tank.
- BUILT IN VALVE: The FSS-754 uses built in valves to equalize the pressure and vacuum. The pressure vent valve allows the pressure relief valve to open at 1.5 Lbs and vacuum release to open at 1.5 Oz. This heavy duty lock is make from hard non ferrous alloy and fits standard 2 inch male thread.
- PATENTED DESIGN: The FSS-754 is different from any other cap on the market today. It is designed with our patented "free-spinning" technology. When the cap is in the secure mode the cap will free spin making it virtually impossible to remove.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00JAO4ZEY |
| Automotive Fit Type | Universal Fit |
| Best Sellers Rank | #33,481 in Automotive ( See Top 100 in Automotive ) #146 in Automotive Replacement Fuel Tank Caps |
| Brand | Flow Security Systems |
| Color | Silver zinc plating |
| Customer Reviews | 4.1 4.1 out of 5 stars (619) |
| Date First Available | January 11, 2010 |
| Exterior Finish | Silver |
| Is Discontinued By Manufacturer | No |
| Item Weight | 1.7 pounds |
| Item dimensions L x W x H | 3.25 x 3.25 x 2.75 inches |
| Item model number | FSS754+Adapter |
| Manufacturer | Flow Security Systems, Inc. |
| Manufacturer Part Number | FSS754+Adapter |
| Material | Hard non-ferrous alloy |
| Product Dimensions | 3.25 x 3.25 x 2.75 inches |
| Special Features | Weather Resistant |
| Style | Including Adapter |

## Product Details

- **Brand:** Flow Security Systems
- **Color:** Silver zinc plating
- **Exterior Finish:** Silver
- **Item dimensions L x W x H:** 3.25 x 3.25 x 2.75 inches
- **Material:** Hard non-ferrous alloy

## Images

![The Flow Security Systems VersaLock | Vented Locking Fuel Tank Cap | For Transfer & Above Ground Commercial Tanks | Prevents Theft & Secures Fuel Tanks | FSS 754 | Includes Adapter | 1CT - Image 1](https://m.media-amazon.com/images/I/71HjNjylbxL.jpg)

## Available Options

This product comes in different **Size, Style** options.

## Questions & Answers

**Q: Can i used for isuzu 2003 frr box truck?**
A: Measure the outlet to see if it's there same size

**Q: Is this product fit on a freightliner m2 straight truck??**
A: I don’t thinks so       This fits a 2inch NPT thread         However there is a locking cap for a freightliner tank       Measure to confirm

**Q: Work on a Transfer Flow auxiliary fuel tank ?**
A: We have a Transfer Flow auxiliary fuel tank and it fit great. Not sure if the tanks are the same size.

**Q: Will this cap fit a transfer flow tank ?**
A: We have ours on a transfer fuel tank, but because we have a pump it is not adequate venting and the sides of the tank suck in.   We take the cap off to pump.  If you have a gravity flow tank it may work just fine.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works great
*by J***D on December 26, 2025*

Proper installation is critical. Instructions and worthless but common sense should be enough. The short end goes on the tank. The flange for tightening the 2” adapter is thin and smooth by design so a pipe wrench is required. A couple drops of loctite will help, too. When putting the cap back on, I found it helps to get it hand tight, and make sure there’s a little play before locking it. When unlocking the cap, you might have to wiggle the cap a little so the lock pin sets properly. One of the complaints I saw was about the cap spraying fuel - especially when the fuel is sloshing in the tank. My guess is that the tank was too full and/or didn’t have baffles. Transfer tanks should not be filled more than 90% of capacity. Works great!

### ⭐⭐⭐⭐⭐ Locking fuel cap
*by J***N on January 20, 2026*

It installed very easily, and I'm satisfied with the product. Just a little extra protection for my expensive heating oil.

### ⭐⭐⭐⭐⭐ Secure cap
*by D***N on May 14, 2022*

Works exactly as advertised. Well made and heavy duty.

## Frequently Bought Together

- The Flow Security Systems VersaLock | Vented Locking Fuel Tank Cap | for Transfer Tanks & Above Ground Commercial Tanks | Prevents Theft & Secures Fuel Tanks | FSS 754 | Includes Adapter
- Apeixoto 3/4 Inch Fuel Swivel, Fuel Hose Swivel with 3/4'' NPT Connector Fuel Plane Swivel with 360 Roating Connector
- Fill-Rite FR1210HA1 12V 15 GPM Fuel Transfer Pump w/Discharge Hose & Automatic Nozzle (Green)

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.jp/products/4150870-the-flow-security-systems-versalock-vented-locking-fuel-tank-cap](https://www.desertcart.jp/products/4150870-the-flow-security-systems-versalock-vented-locking-fuel-tank-cap)

---

*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-05-17*