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The Equinox Quick Release Pin for HD10 / HDPRO Underwater Housing External Ballast is part of the Ballast Release System on the HD10 High Definition Underwater Video Housing for high definition camcorders and the HDPRO housings for the Red One and Sony EX3 cameras. The quick release pin attaches to one of the wings on the housing. If trouble occurs on a dive and you need to get to the surface quickly, simply pull the pin and the wing and handle (ballast) are both released; the housing becomes positive in buoyancy and shoots to the surface. Hang on for the ride!