The IVM-SURGE provides surge protection for the controller and the field devices in the 2 wire path. To suit the ESPLXIVM60
or the ESPLXIVM240.PRO. The ESPLXIVM controller must be properly surge protected and grounded. An IVM-SURGE is required every 500 feet (150 Metres) or every 15 devices, they are also required at the start (near controller) and the end of the 2- wire path.
Rain Bird ESP-LXIVM Two-Wire Controller with Smart Valve Technology