- Custom food-grade wingnuts 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 pair may be purchased.
- These wingnuts are only for use with the Black Berkey Purification Elements and are used with the Black Berkey Element washer
- Wingnut is not interchangeable with the white Super Sterasyl Ceramic filter wingnut
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