Please note that this part only fits the newer Generation 2 FiltoClear 4000. If you are not sure which filter you have please check the wattage of your UV lamp or your filter foams. This is a good way to determine which model you have. If in doubt please call us.
Oase FiltoClear 4000 Replacement Lid Assembly (37516)
Replacement Lid Assembly for Oase FiltoClear 4000 Pressure Filter – Generation 2 (56425).