5pcs 1/8‘’ 3/16" 1/4" PVDF check valve for ozone / Non-return valve for air purifier / Plastic one way valve 3.2mm 4.8mm 6.4mm
https://www.vogueparade.com/shopping/EN/200282142/1/1005002197947806/5pcs-18-316-14-pvdf-check-valve-for-ozone-non-return-valve-for-air-purifier-plastic-one-way-valve-32mm-48mm-64mm//