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High limit, low limit and/or circulator controllers used to regulate boiler water temperature in gas- or oil-fired hydronic heating systems. Controller may be mounted in any positioning and needs no leveling. Separate, easy-to-read, calibrated dial and set point adjustments for each switch. Differential adjustment on low limit or circulator switch. All adjustments accessible inside front cover. Push-in terminals for quick connecting. Single sensing element for easy installation. One SPST and one SPDT snap switches Act independently at respective temperature settings. made in United States. Manufactured by Honeywell.