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Monoblock freeze protection valve

 I can’t find a North American equivalent of a Caleffi IStop.

I could try and order from overseas but would still have to deal with G thread. 

There has to be something locally available that will work.

This would be for an air to water monoblock install in Zone 5.

https://www.caleffi.com/en-int/antifreeze-valve-108-caleffi-108601

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