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A fiberglass double-wall tank is a high-performance containment system featuring an inner tank for product storage and an outer “secondary” wall that acts as a failsafe against leaks. Often referred to as FRP (Fiberglass Reinforced Plastic) tanks, they are the industry standard for underground fuel storage because they are 100% rust-proof and compatible with all modern fuels, including high-ethanol blends and biodiesel





