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I would avoid any use of expanding foam on any plastic, you can see the foam has eaten away at the Hep2O fitting. The effect to rot this away was over time. Expanding foam is only useful for masonary gaps and filling in gaps in PIR board insulation. Hope this helps

Expanding foams are not safe with plastics, see the picture. The foam makes the plastic brittle on the water fittings causing leaks. Avoid using any foam. The fitting had to be changed as it was dripping water through into the ceiling. Even I did not think it was possible for foam to damage a...