Tank Airlock - 1-7/8"
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Dry airlock with marble for variable capacity tanks. Features a threaded shaft, and a plastic back nut with gasket that screws onto the underside.
Fits hole of 1-7/8"
Includes a marble which allows the release of gasses, but will not allow air into the tank. The marble is the sealing device, no water or other valves are used. Features a tab with hole on the top so you can attach a rope for raising or lowering the VC lid.