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Call up Dan Chiles of Watts Heatway. I don't have his number. I had a client with an old Heatway twintran system. We repiped it with a heatexchanger. The tubes were clogged with rust from the oxygen corrosion of the boiler but there was no signs of leakage anywhere. The system was 15 years old or so. WE unclogged the tubes with an air compressor. Dan sent me some manifolds and clamps to do the job. Its been a few years since the project and the client has been happy so far with no problems. I don't have his number. I'm sure you could find watts heatway through google and they would get you in touch with him.
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