Circulator Controller, Application Circulator, Maximum Control Temperature 240 Degrees F, Minimum Control Temperature 100 Degrees F, Differential Temperature 5 Degrees F to 30 Degrees F Adjustable, Mounting Orientation Horizontal, Vertical, Number of Switches 1, Switch Action Makes, Burner Circuit Voltage Type Millivolt, Capillary Tube Length 3 in, Spud Size 3/4 in NPT, Contact Form SPST, Multizone Control Compatible Not Applicable, Product Type Circulator Controller, Probe Length 2 7/8 in