Replacement Parts for Evolution Aqua Nexus Filters Brand_United Aquatics The slots cut in the Basin:FB58E The slots cut in the sides allow water into the pump In testing they produce a slightly larger air bubble than air stones which translates into less oxygen transfer into the water 5") DACE122 48 12mm Equal Tee 1000 030 EAZY Upgrade Kit for Nexus 220 Upgrade post 2006 model 200 210 to 220 EAZYUG220 EAZY Upgrade Kit for Nexus 320 Upgrade post 2006 model 300 310 to 320 EAZYUG320 Universal Bypass Kit for Nexus 300 and 200 (New Model Post June 2006) BYPASSKITNEW Eazy Clear Plastic Lid EAZYLID 12 mm Pipe Clip for Nexus Air Line K81 10 05 3 8" Mini Ball Air Valve (F F) 1000 85 3 8" BSP Male Stud Connector (male ends for mini ball air valve) 1000 80 Air Ring Complete Nexus 200 1200 010 Air Ring Complete Nexus 300 1000 010 12mm x 10mm Natural LPD Nexus Airline 30m Roll 1000 136 Eazy Isolation Pipe 90mm (Universal) 5000 329 Nexus 210 Inlet Plate 1200 410NEW Nexus 310 Inlet Plate 1000 410NEW Nexus Inlet Outlet 110mm to 125mm (Boot 4"to 4") NPC125 Nexus Inlet Outlet 61 68 to 115 122 (Boot 4" to 2") NAC1004 Nexus Inlet Outlet (Boot 4" to 1