Industry wide SHORTAGE-call for alternative.
This Aquastat provides Controller functions, and serves as a Thermostat and Water Level Switch. This product meets specifications for many outdoor boiler models including GX10, GX15, and GX30.
This controller includes the temperature probe cable, 9.5 feet long. The brass temperature probe is 1.5 inches long, and 0.25 inches in diameter. It is recommended to secure temperature probe in thermo-well using high-temp caulk available here.