1pcs I.D 20 25 32 40 50 63mm Water Pump Inlet Outlet Filter PVC Bottom Check Valve Aquarium Fittings
https://www.vogueparade.com/shopping/EN/200282142/1/1005003022472932/1pcs-id-20-25-32-40-50-63mm-water-pump-inlet-outlet-filter-pvc-bottom-check-valve-aquarium-fittings//