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The HK57-2 Heater Kit from Pelco is designed to work with the EH5700 Series Enclosure. These accessories are factory wired with a plug-in connector for use with the O/I-PCB. The O/I-PCB is included with all -1/-2/-3 models. You must order one O/I-PCB if you are using a basic enclosure (EH5723 or EH5729) with these optional accessories.