Oase BioTec 4, 5, 10, 12, 18, 30, and 36 Replacement Parts (Discontinued Models) Part:Foam Holder BioTec 18 or 30 or 36 ALSO consider adding Automatic cleaning Size:22" Round ALSO consider adding Automatic cleaning cycles to the Nexus220 or Nexus 320 with this link GFO or Carbon Replacement parts are available for the following discontinued Oase filters: BioTec 4 SKU UPC Code Description Compatible BioTec Filter 4 5 10 12 18 30 36 54030 706759540308 Red Filter Foam X X X 56739 706759567398 X 40977 706759409773 X X 54031 706759540315 Blue Filter Foam X X X 56738 706759567381 X 40978 706759409780 X X 10648 706759106481 Screenmatic Transformer X X X 11613 706759116138 Inner Body Lip Seal X X 25351 706759253512 Filter Box X 19224 706759192248 Foam Holder X X 19506 706759195065 Flat Gasket X X X X 22279 706759222792 Drain Seal X 45196