Rain Bird ESP (Easy Schedule Programming) Modular Irrigation Controller
The ESP Modular controller is an irrigation timing device for residential and light commercial use. The basic unit supports four valves and a master valve/pump start relay. With the addition of optional internal modules, the ESP Modular can support up to 13 valves (including an auxiliary valve), and a master valve/pump start relay.
This module has the VT (valve test), MV (master valve), COM (common) terminals, plus the first four station terminals
Rain Bird Main Module
This module has the VT (valve test), MV (master valve), COM (common) terminals, plus the first four station terminals
Expansion Module
Adds three additional zones to RainBird modular controllers comes with all 3