Diesel Keeper is the official North American manufacturer and distributor of the Diesel Keeper ASDs, or Anti-Siphon Devices. These units are critical to preventing diesel fuel theft. Our patent-pending technology makes our ASDs unique in the fact that they allow maximum fuel flow while keeping the grids small that even tiny siphon tubes can't get in. The stainless steel structure can't be drilled out or removed. Diesel Keeper ASDs are the ultimate in diesel fuel security. Stop Diesel Theft. Prevent Diesel Siphoning. Keep Your Diesel With Diesel Keeper!

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