10 Pack 1.75" Boat Gas Cap O-Ring Marine Deck Fill Gasket Compatible with Perko 540/0540 Series, Replaces 54000099B, Oil-Resistant Rubber for Fuel, Diesel, Water & Waste Fill – Leak-Proof Seal

1.75 in Boat Gas Cap O-Ring Marine Deck Fill O-Ring Cap Gasket Compatible with Perko Marine 0540DPG99A Replace54000099B1. Universal Fit for Perko 540 Series Deck FillsDirectly replaces Perko 54000099B o-rings on all 540/0540 series deck filler caps. Compatible with threaded aluminum and stainless steel ports used for gasoline, diesel, water, and waste tanks. Fits fishing boats, sailboats, yachts, and cruisers – ideal for regular seasonal maintenance or onboard emergency repair kits. Simply match your cap model to ensure a perfect seal.2. Marine-Grade Oil-Resistant RubberCrafted from heavy-duty oil-resistant rubber engineered to withstand harsh marine environments. Resists saltwater corrosion, UV exposure, temperature swings, and swelling that causes common O-rings to fail. Maintains flexibility and sealing pressure season after season, providing long-term reliability for fuel, water, and waste deck fill applications.3. Excellent Leak PreventionPrecision molded to 1.75" inner diameter by 0.14" thickness for a snug, uniform fit. The resilient material compresses evenly to create a tight barrier against fuel vapors, water intrusion, and diesel spills, protecting your boat's deck and interior from moisture and odor while ensuring safe, worry-free operation.4. Extra-Large 10-Pack ValueUnlike standard 2- or 5-packs, you get 10 O-rings—enough to replace all caps on a multi-tank vessel and still have spares for years of routine maintenance. Perfect for charter boats, dual-tank setups, or keeping a backup kit in your onboard toolbox. Change them annually to prevent sudden leaks.5. Quick, Tool-Free Installation & SupportNo tools needed. Simply unscrew the deck fill cap, remove the old flattened or cracked gasket, stretch the new O-ring into the groove, and tighten. Take seconds per cap. If you have any fitment or material questions, our support team is ready to assist – ensuring you order with confidence.

• Universal Fit for Perko 540 Series Deck Fills: Directly replaces Perko 54000099B o-rings on all 540/0540 series deck filler caps. Compatible with threaded aluminum and stainless steel ports used for gasoline, diesel, water, and waste tanks. Fits fishing boats, sailboats, yachts, and cruisers – ideal for regular seasonal maintenance or onboard emergency repair kits. Simply match your cap model to ensure a perfect seal.
• Marine-Grade Oil-Resistant Rubber: Crafted from heavy-duty oil-resistant rubber engineered to withstand harsh marine environments. Resists saltwater corrosion, UV exposure, temperature swings, and swelling that causes common O-rings to fail. Maintains flexibility and sealing pressure season after season, providing long-term reliability for fuel, water, and waste deck fill applications.
• Excellent Leak Prevention: Precision molded to 1.75" inner diameter by 0.14" thickness for a snug, uniform fit. The resilient material compresses evenly to create a tight barrier against fuel vapors, water intrusion, and diesel spills, protecting your boat's deck and interior from moisture and odor while ensuring safe, worry-free operation.
• Extra-Large 10-Pack Value: Unlike standard 2- or 5-packs, you get 10 O-rings—enough to replace all caps on a multi-tank vessel and still have spares for years of routine maintenance. Perfect for charter boats, dual-tank setups, or keeping a backup kit in your onboard toolbox. Change them annually to prevent sudden leaks.
• Quick, Tool-Free Installation & Support: No tools needed. Simply unscrew the deck fill cap, remove the old flattened or cracked gasket, stretch the new O-ring into the groove, and tighten. Take seconds per cap. If you have any fitment or material questions, our support team is ready to assist – ensuring you order with confidence.