Large Inflatable Rubber Plugs have been in use in large-scale infrastructure projects since at least the early 1920’s, when they were used in large cities to isolate and empty sewer sections to enable repairs avoiding excavation.
The low-cost, hand-held PurgEye® 100 is designed for welding stainless steel, reading accurately from atmospheric oxygen level (20.94%), right down to 100 ppm (0.01%) of oxygen.