British Berkefeld Black Universal Wing Nut

If you’re replacing the filter in a gravity water filter system, you’ll need one of these universal wingnuts to keep the filter candle in place – along with a rubber sealing filter washer (sold separately.) One wingnut is included per pack, and as with all Doulton® parts, they’re fully tested to guarantee the best results. Black plastic wing nut for replacing filters in a gravity-fed water filter… product details