Irrigation Caddy H-500 Expansion HubOverview Specifications The H 500 expansion hub can be used to add 2 or more zone expansion modules to the IC W1 WiFi Irrigation Controller. The H 500 can be plugged into the expansion port of the IC W1 unit, and expanders can then be connected to the H 500. Up to 4 expansion modules can be connected to the H 500. Use independantly with the new Irrigation Caddy W1 or connect up to 4 exp 800s using the H 500 expansion hub. General Information