Johnson Controls A28PJ-1C : Two-Stage Agricultural Thermostat, 30 to 110 Deg F (-1 to 43 C), Fixed Differential 2 Deg F (1.1 C) Each Stage, Adjustable Differential 2.7 to 7 Deg F (1.1 to 3.9 C) Between Stages, 2x SPDT, NEMA 4X, 1-3/8 x 2-1/4" Coiled Bulb, 1/4HP