The Balboa Exp. Board Pump Relay (GS-GL) is compatible with the GS series control boxes such as GS510, GS511, GS514 etc.
Also GL series such as GL2000 and GL2001.
This PCB is used as a replacement for an existing PCB failure. This must not be fitted to any other device / product. This should be done by an experienced tradesman or a competent individual as a faulty install could result in board damage and invalidate warranty.
The Image shown is an example expansion board, the actual part is as described above and may be different. Please call to confirm your part if you are unsure.