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