Many places require a cold water check valve or anti siphon for outside hoses and DR sinks
Factories too
I have to sign a paper each year, in this small town, everybody does
Hot water does not need it, as 'normal' Hot Water heaters prevent by design
The HASS is a good one
The problem is backflow to potable sources
https://goodbeeplumbinganddrains.com...20your%20pipes.
Bookmarks