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All 2 Pump J-300 models 06/2018 -2019. Encrypted board. 

6600-502 Replaces 6600-419

All export 2 pump J-300 models 2020+. Encrypted board. Will not work with older control 
panels. When used in pre-06/2018 spas needs to be reprogrammed with a Pick-iT kit

Jacuzzi 300 Series PCB compatible with 

• J385, J375 ,J365, J355, J345, J335