Irrigation Valves are used to create various watering zones in an irrigation system. This separation allows for different watering devices to be encompassed in a single system. 

    Deciding how large a valve should be depends on your system's flow rate. 3/4-inch valves are ideal for most residential applications where the flow rate is around 8 to 10 gpm (gallons per minute). If the flow rate exceeds 15 gpm, you should use a 1-inch valve. 

    Make sure the sprinkler valve is closed, unless it's the valve farthest from the main water source. You'll want to leave this valve open and remove the sprinkler nozzle to allow air to escape when you turn on the water