EPA/CARB COMPLIANT Direct factory replacement parts for your portable fuel tank. Same components used in the original tank contruction. EPA and CARB approved 2 stage portable tank fuel cap. Fits both pre and post 2011 Moeller and Tempo Style Portable Fuel Tanks. Audible click signals that cap is sealed on neck fill. Tether secures cap to fuel tank while refueling. Auto-self venting pressure feature vents tank above 5 PSI when center pop-up vent is in the open position. Manual momentary pressure relief valve relieves pressure prior to cap removal. Positive vent closure for storage and transportation.