Balboa Expansion PCB for spa controllers. This is the 3-wire version, with two relays. May have part numbers 55137, X-P332 or other numbers. 

This product can only be used to replace existing expansion PCB, can not be used with a controller that did not originally have it fitted.

Can run either of the following:
* 1 x 2 speed Pump
* 2 x Single Speed Pumps(Using AMP Splitter)
* 1 x Blower and 1 x Single Speed Pump(Using AMP Splitter)