The Caleffi 317062 Z-ONE THREE ZONE VALVE RELAY is a three zone valve relay that is designed to control the flow of water, gas, or oil. This relay is compatible with a variety of valves, and can be used to control the flow of water, gas, or oil in a pipeline, water treatment plant, or oil refinery. The Caleffi 317062 Z-ONE THREE ZONE VALVE RELAY is a three zone valve relay that is designed to control the flow of water, gas, or oil. This relay is compatible with a variety of valves, and can be used to control the flow of water, gas, or oil in a pipeline, water treatment plant, or oil refinery.