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    Cast Iron Radiator Re-Pipe to Pex Home Runs

    I am preparing to re-pipe my home's early 1900s cast iron radiator system from black iron branch arms to a 1/2" pex-al-pex home run system. The home has 12 radiators - 6 upstairs and 6 downstairs. The boiler is in the basement and the ceiling is now fully exposed, allowing access to riser ends...
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