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Single connector to the circuit board with two sensors, the larger  temperature 3/8 sensor goes into the spa and the smaller 1/4" high limit sensor goes into the heater back. If your reads 30288 or 30337 this is the sensor for you.

For your identification the cable label will read:

S/N 30337 SENSOR ASSY 96" (3/8, 31" (1/4), it may also have a D1 part number 01560-76