This listing is for a pair.
Custom food-grade washer used on the Black Berkey Purification Elements to seal the lower chamber and upper chamber when attaching the elements to the system
Each set of Black Berkey Purification Elements comes standard with a set of washers; in case of loss or damage, replacement washers may be purchased individually
This washer is only for use with the Black Berkey Purification Elements and is used with the Black Berkey wingnut
This washer is not interchangeable with the white Super Sterasyl Ceramic filter washer