ESPSM3 Easily expand your Rain Bird ESP - Modular Series Controller from a 4 station base model up to 13 stations or your ESP-ME Controller from 4 stations up to 22 stations with this 3 station hot-swappable module, which can be added without powering down the controller. Modules can be installed in any available slot.
Adds three additional stations to Rain Bird residential modular controllers
Hot-swappable 3-station expansion module can be installed without powering down the controller
Compatible with Rain Bird ESP-M, ESP-Me, ESP-SMT and ESP-SMTe series irrigation controllers
Can be installed in any available slot