Cherne Underground manufactures a full line of pipe plugs and testing equipment for sewer lines. Inflatable plugs up to 96” are available with or without bypasses for low pressure applications. Mechanical plugs and high pressurecheren plugs are also available. Cherne also makes vacuum manhole testers, joint testers, hydrostatic test pumps, deflection gauges, cleaning balls, line stringers, smoke blowers, smoke bombs, liquid smoke, and point repair carriers and custom plugs.