Adjustable controller with water hacket thread-in probe • Adjustable turn-on temperature from 150 - 240 degrees • Turn-off temperature 10 degrees less than turn-on • Two probes available, 3/8” NPT water jacket thread-in or push-in radiator fin probe • 30/40 Amp heavy-duty relay included in kit, necessary if electric fan draws over 10 Amps • A/C override circuit included • Designed for dual fans • Maximum capacity: 25 Amps