The invention relates to a capless ORVR system providing sealing and reducing hydrocarbon outlet and comprising a wave seal (11), a primary flapper (3), and a secondary flapper (10) for preventing outlet of hydrocarbons by means of surrounding the nozzle while the nozzle is being placed, allowing uni-directional flow to continue and preventing backflow when there is pressure in the opposite direction from within, and allowing the fuel to exit through the filler neck by being bent outwards.