OASE Biotec 5/10 Inner Lip Seal by Oase $ 11.99 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart Replacement Inner Lip Seal for OASE Biotec 5 and Biotec 10 Pond Filters. 11613 Inner Lip Seal Fits: Biotec 5 Biotec 10