Replacement Yellow Coarse Sponge Pre-filter Ring for FZ15-UV, 1 PackReplacement Sponge Filter for Aquatop FZ15 UV Canister Filter Aquatop OEM Replacement Parts Policy "Aquatop parts are designed and intended as original equipment replacement only for Aquatop branded products. Use in brands other than Aquatop can result in poor performance, leaks, and failure and Aquatop offers no warranty for any problem arising from the use of Aquatop replacement parts in another brand of product."