http://www.vacuumboxtesting.com/ An efficient method for leak testing welds is using a vacuum box to pull negative pressure on one side while then looking for bubbles through a soap solution. The test is performed by one person. The vacuum box is a clear Plexiglas plate with soft gasketing around the edges. The vacuum is pulled by using a standard shop air connection hooked up to a venturi nozzle. The air blowing through the venturi creates a low pressure area through the restriction; a port at this p

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