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Ao Smith 100110044 is a high limit control kit for AO Smith water heaters, designated Style 4400 Series 66T. The device provides high-limit temperature protection with a double pole, single throw (DPST) switch that opens the circuit at 170 F and requires manual reset. It is designed so it cannot be blocked shut and serves as an OEM replacement, replacing part 9004718115 and compatible with Lochinvar and Ao Smith equipment.
High-limit safety control with DPST action and manual reset for water heater protection
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