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Balboa Extension 2-Relay Circuit Board | 55137
The Balboa Extension 2-Relay Circuit Board 55137 is a replacement for many 2-relay circuit boards by Balboa® and serves as a direct upgrade for many models. This is the 3-wire version with two relays that is used to add a 2-speed pump output. This is an expander circuit board for 2nd pump used ...
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