3 piece airlock
The 3-Piece airlock is the best choice for the primary fermenter, since it comes apart for easy cleaning in the event of a blow-off. Fill to the line with boiled water or sanitizer to create a closed fermenting system that allows CO2 to escape, but does not allow air back in to contaminate your beer or wine.
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This airlock is ideal for making mead and wines that require prolonged aging. Do regularly check for blockages otherwise the pressure build-up can cause the airlock to blow off.