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To protect your fuel tank, make sure you install a quality boat fuel cap. A proper boat gas cap comes with a clear label for the type of fuel, can include a vent and might even lock to protect your fuel. Having a boat gas cap key within easy reach is also vital during the busy summer months. Fisheries Supply is your premier supplier of marine gas caps and boat water fills from the top brands. We offer a full-range of deck fills – including boat fuel filler fittings, marine water fills, and waste fills – along with a variety of multi-purpose boat fuel cap keys and replacement marine fuel caps. We even offer EPA compliant fuel fills for your sailboat, power or pontoon boat – so shop today and save. If you are also setting up the tank, browse our great selection of boat fuel tank vents.