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Hydro-Quip 4-Pole 2-Wire Gecko Series Temperature Sensor with 3/8" Bulb and 10' Cord, 34-0203D-K is designed for spa and pool control systems. It features a 3/8-inch diameter bulb and a 10-foot cord, making it easy to install and connect to your system. This temperature sensor is compatible with Gecko CS4/6200, 4/6220, 4/6230, 4/6330, 7500, and 9700 control systems.
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