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Easy to install and Extremely Secure.
All of our Anti-Siphons install easily in most HD & MD Freightliner, Kenworth, Western Star, Sterling, Volvo, Mack, International, and Peterbilt diesel fuel tank necks, as well as many buses and foreign Class 7 Trucks. Anti-Siphons are guaranteed for the life of the fuel tank they are installed in. They do not restrict fueling and there is no splash-back. Over 800,000 in use!
These patented snap-in Anti-Siphons are an inexpensive and effective solution to help prevent fuel theft. Made in the U.S.A. from the finest quality materials, these Anti-Siphons are designed to foil the most determined fuel thief.
The S behind the part number signifies that the Anti-Siphon has an additional protection of a heavy-duty strainer installed. 3-7, 25-675, 25-95, 225-7, 4-9 & P-67 are for Heavy-Duty (Class 8) Truck Diesel Fuel Tank Applications. 187-75, 2-7, 2-7K are for Medium-Duty (Class 7) Truck Fuel Tank Applications.
Measurements are from the Inside Diameter (ID) of the fuel tank neck. Freightliner Class 8 are 2 ¼” ID. Volvo, Mack, and International are either 2.5” or 3” ID. Sterling are 2 ¼” or 3” ID. Kenworth are normally 2 ½”. A measurement of the ID of the fuel tank neck is always advised. Medium Duty Class 7 International are usually 1 7/8” ID, Kenworth and Freightliner (M2) are 2” ID. Reefer tanks are 1 7/8” ID. Anti-Siphons will install in male threaded fuel necks at least 3” long. 25-95, 187-75, 2-7, and 2-7K must be used with non-locking female threaded caps. If there is a weld bead on the inside of the fuel tank neck, or it is a very tight fit do not try to install an Anti-Siphon. For extra protection the 3-7, 25-675, 225-7 and 4-9 can be used with Locking Caps as well as Non-Locking Caps.