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Honeywell Home Prestige® YTHM5421R1010/U IAQ Equipment Interface Module Kit, For Use With All THX9421R5021 Prestige® 2-Wire IAQ Thermostat and all Versions of Prestige® IAQ Thermostat and the VisionPRO® Thermostat with RedLINK™ Technology, Gray, Import

MFG Part#YTHM5421R1010

DSG#70549

Honeywell Home Prestige® YTHM5421R1010/U IAQ Equipment Interface Module Kit, For Use With All THX9421R5021 Prestige® 2-Wire IAQ Thermostat and all Versions of Prestige® IAQ Thermostat and the VisionPRO® Thermostat with RedLINK™ Technology, Gray, Import

MFG Part#YTHM5421R1010

DSG#70549