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- "Gas Lox" Locking Gas Cap, circa 1940 - Gas caps serve multiple purposes. They keep contaminants away from fuel, they prevent gasoline from evaporating, and they stop condensation from forming inside the tank. Modern gas caps are often tied to the vehicle with a cable or strap to avoid losing them. Some caps have built-in locks to prevent anyone from filling -- or emptying -- the tank without a key.

- circa 1940
- Collections - Artifact
"Gas Lox" Locking Gas Cap, circa 1940
Gas caps serve multiple purposes. They keep contaminants away from fuel, they prevent gasoline from evaporating, and they stop condensation from forming inside the tank. Modern gas caps are often tied to the vehicle with a cable or strap to avoid losing them. Some caps have built-in locks to prevent anyone from filling -- or emptying -- the tank without a key.