3ct. - 3 Piece Airlock with #7 Stopper - Set of 3 (Cylinder Airlock)
3 piece airlocks with #7 rubber stoppers. Use this airlock and stopper in your fermenter to create a closed system that allows CO2 out and prevents harmful bacteria from getting in. Fill to the marked line with sanitizer or boiled water. Use with a drilled stopper. These stopper fit most gallon jugs and 38mm screw cap jugs.
