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ATP921R3100 evohome Base pack
T4 wired Thermostat, Wall mounted
A wide range of reliable heating and cooling control products and solutions
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Easily-Installed Adaptor Kits The Honeywell Home 40003918 series of adaptor kits from Resideo work with a variety of zone valves. Each comes with an adapter plate, ball and shaft assembly, large o-ring, and four mounting screws.