Key Features Genuine Oase Parts Part No 16031 Quartz Locking Nut Set Fits the Filtoclear 12000, 16000, 20000 & 30000 Filter Easy to replace Replacement Quartz Locking Nut set for the Oase Filtoclear 12000, 16000, 20000, 30000 Pond filter. The Quartz nut set can be used to replace any missing or damaged part of your UV unit inside your Filtoclear filter. The set includes replacement O rings, locking nuts and other parts that surround your UV and its Quartz. Specifications Part No 16031 Will fit the Filtoclear 12000, 16000, 20000, 30000