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This John Guest TSI20 Super Seal Insert is a PEX plastic insert designed for used with 1/2" CTS pipe and fittings. This corrosion and scale-resistant insert is used to create a secondary seal that prevents leaks and weeping. Using an insert also ensures that pipe has a clean end that's free of any imperfections from cutting that may hurt the integrity of the seal. The insert also helps pipe and tube maintain consistent shape.
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