Water Timer. Where, when and how much to water. Gilmours mechanical timers shut off automatically and have a manual on/off. With the single outlet you can have continuous watering up to 120 minutes. Full flow outlet for more sprinkler performance this timer works with water pressure ranging from 15 to 120psi and works with My Design Sprinkler Kits. Not for use with hot water. Manual on/off. Full flow outlet for more sprinkler performance. Works with water pressure ranging from 15120 psi. Continuous watering up to 120 minutes. Works with My Design Sprinkler Kits.