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"If there be any among us who [disagree], let them stand undisturbed as monuments of the safety with which error of opinion may be tolerated, where reason is left free to combat it." Thomas Jefferson, March 4, 1801
Antidrain valve, aka, Auto Drain, aka Freeze Drain valve. Holds pressure while the system is on, but when the system turns off it'll open up to drain the system. Of course it should be located at the lowest point in the system and all flow paths will need to drain to it to completely empty the system. (BRASS) Works great in misting systems.