Class action lawsuits have been filed against the manufacturers of Uponor / Wirsbo “PEX” plumbing sytems, and Uponor / Wirsbo fittings used in residential construction: Uponor, the manufacturer of Uponor PEX and fittings has been sued.
Uponor / Wirsbo plumbing systems and fittings may allegedly fail prematurely causing leaks and water damage to your property. At least 
one expert evaluation has found that Uponor / Wirsbo fittings may have a manufacturing defect that can cause corrosion. Corrosion can result in leaks and other problems with your plumbing system.
Uponor / Wirsbo PEX plumbing systems for residential and commercial applications use crosslinked polyethylene (PEX) tubing instead of metal piping to distribute the water.
Uponor / Wirsbo plumbing systems and fittings allegedly may fail when they are exposed to water because of a chemical reaction known as dezincification, which results in reduced water flow and leaks. Dezincified Uponor / Wirsbo plumbing systems and fittings cause damage not only when they burst and leak, but also impair the ability of a home’s plumbing system to effectively provide water to appliances and fixtures.