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Editing Step 33 —

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If you have a hand vacuum pump, this next step is highly recommended as it can detect any leaks before the OpenROV is in the water.

Remove one of the syinges and replace with a fitted nozzle or fit a nozzle over the entire surface as shown.

Pump about 15mmHg (or equivalent) and hold. Watch if there is a loss of pressure. If after a few minutes there is no loss of pressure consider this an adequate seal.

Don't forget to replace the plunger.