Irrigation Caddy EXP-800 8-Zone Expansion ModuleOverview Specifications 8 Zone Expansion Module. The IC W1 IrrigationController can be expanded to 43 zones by adding EXP 800 expansion modules. Using the H 500 expansion Hub you can add a maximum of 4 modules to your Irrigation Caddy. Connect 4 to create 43 zones with your Irrigation Caddy Use independantly with the new Irrigation Caddy W1 or connect up to 4 exp 800s using the H 500 expansion hub. General Information Manufacturer Irrigation Caddy