Choose Options Mack Leak Defender Fuel Cap and Collar Heavy Truck Solutions MSRP: Now: $296.95 Was: Mack Leak Defender Fuel Cap and Collar *If your truck has dual tanks, you'll need to purchase two fuel caps. The Leak Defender Mack fuel cap and collar kit is more than just shiny chrome, it's an entire 2-piece fuel neck replacement that stops cap... MSRP: Now: $296.95 Was: Choose Options