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Serving San Antonio, Texas and the surrounding areas since 1978.

Diesel Tank Locking Cap



Diesel Locking Fuel Cap - $59.95

Save $10 when you purchase a Diesel Transfer Tank

FSS-754 Versalock,Diesel Tank Vented Locking Fuel Cap, is a quick and easy way to safeguard the cost of fuel and oil from theft, tampering, and vandalism. It’s designed for use on mobile transfer tanks as well as above ground commercial gas and distillate tanks. The FSS-754 uses built in valves to equalize the pressure and vacuum, making it different from any other cap today, with Spinsecure’s patented "free-spinning technology."

  • For use on all 2" male or female threads*
  • Can be keyed alike for multiple use convenience
  • Weather proof self-closing latch covering the face of the lock
  • Made from non-corrosive material for years of use.


  • Includes 2 keys
  • For diesel use only
  • Pressure Release Valve opens at 1.5 lbs.
  • Vacuum Release opens at 1.5 oz
  • Pumps up to 20 Gallons per minute
  • Made from hard non ferrous alloy
  • Weatherproof self closing latch prevents moisture, dirt or debris from entering lock
  • Fits all standard 2" male thread(male adapter sold separately for use on female thread application)