All GS and GL Balboa systems such as GS500, GS501, GS510, GS511, GS520, GS523, GL2000, GL2001 and GL8000. You will most likely find this style of connection on other electronic spa systems also.
Additional Notes:
Pack include:
x1: 4 pin amp - 4 core cable used mainly for a 2 speed pump.
x3: 3 pin amp - 3 core cable used mainly for a 1 speed pump or blower
x1: 2 pin amp - 2 core cable used mainly for lights
