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A:The capillary tube from each of the 5 thermostats are routed from the control panel wrapped around the flexible conduit, into the steam well body and are secured to the bottom of each well element pan. These capillary tubes are filled with an oil as to apply pressure to the thermostat switch and expands as the element heats up to maintain temps in each well, separately. If the installer cuts these tubes during install and then uses wire nuts to assemble back together, then these thermostats need to be replaced, but is not a warranty parts or labor. .