High/Low Limit Controller, Application Circulator, High Limit, Maximum Control Temperature 240 Degrees F, Minimum Control Temperature 130 Degrees F, Differential Temperature 10 Degrees F Fixed, Mounting Orientation Horizontal, Number of Switches 2, Burner Circuit Voltage Type Low Voltage, Spud Size 3/4 in NPT, Contact Form SPST, Multizone Control Compatible Not Applicable, Product Type High/Low Limit Controller, Auto/Manual Switch Included Yes, Overall Depth 2 3/4 in, Overall Height 3 7/8 in