The 4 zone Hydrologic Timer has higher flow valves. It also allows
programming for individual days of the week. The new timer works with
the Melnor Hydrologic Soil Moisture Sensor. Each zone can be
independently programmed with up to 4 start times. No extra valse to
buy. 25% larger screen then previous model. Retains programming through
battery change. Manual rain delay. Grey/Black.