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 pressure plugs are also available. Since 1998, Cherne Industries has been certified to the ISO9001 internationally-recognized Standard for Quality Management Systems. Covering companies that design, manufacture, test, and service a particular product, the ISO9001 standard is governed by the International Organization for Standardization (ISO)—a worldwide federation of national standards bodies from over 100 countries.