FUELSAFE Anti-Siphon Device | Vetus FUELSAFE Vetus FUELSAFE Anti-Siphon Device | FUELSAFE Anti-siphon device prevents theft of fuel from tank by preventing hose from being inserted into fuel tank. Vetus fuel safe anti-siphon device Easily installs in your boat's fuel fill hose line to prevent siphoning Suitable for 1 1/2 in. or 2 in. internal diameter fuel fill hose Made from gasoline and diesel resistant synthetic plastic 2 3/16 in. x 2 13/16 in. dimensions