A range of fuel tank valves that allows air in to the tank to replace fuel used and air out due to heat expansion. This breather also provides a positive shut off to prevent fuel escape, due to splashing or even roll over. This is achieved by a two ball system, one hollow plastic, one solid steel.
For fitting to tank through a 7/16" (11mm) hole. Access from inside the tank is required. Vertical vent pipe takes 1/4" bore hose.