

This valve is sold with a hand pump to create a vacuum inside your housing, allowing to check if the housing is watertight actually before having it submerged. This version has an electronic circuit powered by a rechargeable battery. This temperature-compensated circuit monitors the vaccum. A LED light informs in real-time if the vacuum is maintained above or under water.
Please note this is a special order with a 10-day schedule before shipment unless product is in stock.