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zurn pex brass fittings corroding only on cold water
working on a job 10 to 15 year old install all pex with zurn fittings blue and red no manufacturer on pipe. its a well all the hot water fittings are good but the cold water are all leaking . I'm going to replace them with plastic but wanted to know if anyone has an idea why this is happening. oil fired water heater with dielectric nipples. thanks mike