All of our Anti-Siphons install easily in most HD & MD Freightliner, Kenworth, Western Star, Sterling, Volvo, Mack and International diesel fuel tank necks, as well as many buses and foreign Class 7 Trucks.  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.  Deter the most determined fuel thief with these Anti-Siphons.

Use with your Male Threaded Alum and Steel Fill Neck tanks.  Measure the ID of any fuel tank neck to ensure proper fit. 

Easy to install and Extremely Secure. Contact Us if the size you need is not available.