The Tekmar Solar Sensor 079 has a stainless steel sleeve which is 3/16 OD and 1-1/2 inch long and is designed for use in concrete - thinset - grout - solar panel or solar tanks for solar domestic water heat or solar space heat. The Tekmar 079 Solar Sensor is supplied with 10 ft of 2 conductor wire to connect to a solar setpoint or solar heat control. If used in a Solar Panel a protective sleeve such as a heat shrink kit is recommended where the sensor exits the solar panel to protect the wires from melting.
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TEKMAR web site
Product Spec Sheet