2pcs 3,4,6,8,10,12mm Plastic One-Way Non-Return Pagoda Inline Fluids Check Valve for Fuel Gas Liquid Ozone-Resistant Water Stop
https://www.vogueparade.com/shopping/EN/200282142/1/1005001690369298/2pcs-34681012mm-plastic-one-way-non-return-pagoda-inline-fluids-check-valve-for-fuel-gas-liquid-ozone-resistant-water-stop//