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Emil Jaranilla (1) has asked for suggestions on a housing vacuum leak detector in the Classifieds Section, and here are some thoughts. Vacuum leak detectors use the change in air pressure inside the housing to detect a leak. The detector is electronic and quite small, it uses a small battery for power. The detector screws into the threaded bulkhead (threaded hole plugged with a screw plug) found in most larger camera housings; the thread is M14 or M16 x 1 mm. The detector has a green LED to signal if the vacuum is OK, or a pressure drop has occurred, a red LED blinks. After the camera has been mounted and the housing has been closed, air is pumped out of the housing with a hand pump or a small electric pump until the green LED blinks. I have used the Vivid electric pump for the past three or so years and it has worked well. Maintenance of the vacuum leak detector is simple, just keep it clean and check before dives that it is screwed in properly. Changing the battery takes about two minutes, I carry two spare batteries and O rings. Here is a photo of the entire assembly, with the vacuum pump at the bottom; the disassembled leak detector is shown above the 6 mm hex wrench. The electronic vacuum detector is the small round disk in the top middle, the blue battery is under it; the Allen hex wrench is used to tighten the mount ring; the electric pump is at the bottom with its screw-on hose on the left. The vacuum leak detector unit on the left, with the electronic vacuum detector unit on the right, it is the small white disc. The Vivid Vacuum Leak Detector can be purchased from a camera dealer or directly from Miso Milivojevic - firstname.lastname@example.org. Note: The moisture-water detector is a different and separate unit built by the manufacturer into most new larger camera housings; it has two bare electrodes mounted inside the housing’s bottom, so if water enters, current will flow between the electrodes to flash an alarm light and ring a loud bell or buzzer. Both units, vacuum and moisture, are essential for the safe operation of an underwater camera housing. - 1.