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Cherne Industries, part of the Oatey Co. family of companies, today announced the addition of 24-60 inch test plugs within its I-Series line of Test-Ball, Muni-Ball, and Air-Loc pipe plugs. I-Series plugs are built using an innovative robotic manufacturing system that delivers industry-leading quality, consistency, and durability. Cherne’s I-Series Test Plugs provide improved performance and safety through their optimized design. Manufactured robotically, each plug’s natural rubber core is mechanically bonded to its aluminum end plate, ensuring precision and consistency while eliminating failures that can result from chemical-bonding processes. In addition, I-Series plugs feature corrosion-resistant aluminum base plates with laser-etched identifiers, replacing the use of raised rubber markings that eventually wear away with usage.