Nuke Performance - Tank Vent Safety Valve AN-8 (3/4 UNF) to AN-10 MaleThe AN8 rollover safety valve allows the fuel tank or fuel cell to maintain its status without pressure build up or unwanted vacuum during use. And it is equipped with roll over protection if an accident would occur and the car would end up on its roof. Comes in three different sizes, all safe for petrol, ethanol and methanol. Used as standard on the Nuke Performance CFC Units. Comes with a Viton O ring. Easy to clean, inspect and maintain with its