Perko Fuel System Locking Insert f/ 1-1/2" Vented Fills

The Perko Fuel System Locking Insert for 1-1/2" Vented Fills is a security-focused fuel cap solution designed to prevent unauthorized access to fuel tanks on marine vessels, RVs, and other vehicles. This black plastic locking insert with zinc alloy lock cylinder installs directly into most Perko vented fuel fill openings, providing dual-purpose keyed access that secures both the filler cap and the insert itself with a single key.

The insert's dual-key design is the critical advantage here—a single key operates both the fill cap and the locking mechanism, eliminating the need to manage multiple keys or worry about incompatible locks. The black plastic construction resists corrosion in marine environments, while the zinc alloy lock cylinder provides reliable security without excessive weight. The 1-1/2" opening size covers a wide range of Perko vented fuel system applications, making this insert compatible with most Perko fill caps on the market.

This insert addresses a practical concern for boat owners, fleet managers, and RV operators: fuel theft and unauthorized tank access. Offshore and coastal environments present heightened risk, particularly when vessels are unattended at dock or moored in busy harbors. The locking insert raises the barrier against opportunistic theft while maintaining the convenience of the Perko vented fill system. Installation is straightforward for any fuel system already fitted with a compatible Perko fill opening—no additional drilling or modifications required.