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Installed 2 zones BB PEX (expander) the gauge dropped during test after 5 minutes but was ok on initial test before walls and ceilings went up. Might have a leak. Here's my question is there a solution I can use in the system that would seal the leak? At 80SPI the pressure dropped but at 20 PSI the gauge did not drop.
I hate to bust into those nice new ceilings. Was wondering if there is a sealer that might get me by.