Perko Spare Gas Cap w/O-Ring & Cable

The Perko Spare Gas Cap with O-Ring and Cable is an essential replacement part for any boater who spends serious time on the water. Whether you're running a center console, cabin cruiser, or open fishing boat, fuel tank integrity is non-negotiable—and a worn or missing gas cap compromises both safety and performance.

This marine-grade cap assembly pairs a reliable sealing design with a tethered cable, ensuring you'll never lose it overboard or leave it behind at the fuel dock. Built to Perko's exacting marine standards, this spare cap features an integrated O-ring that creates a secure, watertight seal around your fuel tank opening. The O-ring design prevents fuel slosh, vapors, and contamination from entering the tank during rough seas or high-speed running—critical for engine longevity and fuel system cleanliness.

The attached cable keeps the cap tethered to the tank or filler neck, eliminating the frustration of fumbling for a replacement cap in choppy conditions or simply avoiding the accidental loss that comes with older, unattached designs. This replacement cap suits recreational and commercial vessels equipped with Perko fuel system components—a standard fixture on quality fishing boats, cruisers, and workboats built over the past three decades. Installation is straightforward: simply thread the cap onto your existing fuel tank fitting until hand-tight, and the O-ring compresses to form a permanent seal.