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Fuel Tank Fill Neck Anti-Siphons

Designed to Fit:

Freightliner, Kenworth, Volvo, Mack, International, Reefer, MD International & Misc. 2" Applications 4" Applications Request Pricing

FTA Anti Siphon Aug 2022
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Designed to be used with Male Threaded Alum and Steel Fill Necks. Measurement of the ID of any fuel tank neck is always advised.

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 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.

3-7, 25-675, 25-7, 225-7 & 4-9 are for Heavy-Duty Truck Diesel Fuel Tank Applications. 187-75, 2-7, & 2-7K are for Medium-Duty Truck Fuel Tank Applications.

Measurements are from the Inside Diameter (ID) of the fuel tank neck. Freightliner Class 8 are 2 1/4” ID. Volvo, Mack, and International are either 2.5" or 3"ID. Sterling are 2 1/4” or 3”ID. Kenworth are normally 2 1/2”. A measurement of the ID of the fuel tank fill 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. (Note) Locking Caps are not compatible to use with a fuel fill neck that has an Anti-Siphon installed except the Freightliner Cam-Cap Style.


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