How to winterize your irrigation backflow device
Winterizing your backflow device properly is easy, will save you a great deal of money and only takes one or two minutes:
1. Shut off the water to your sprinkler system at the main valve or stop-and-waste.
2. The next step will require a standard small flat head screw driver. Drain the water from the backflow preventer by opening the test cocks. (There are 2 test cocks on the side or top of your backflow preventer), to open them turn the little screws ¼ of a turn.
3. Turn the valves on either side of the assembly ¼ turn so they are not completely closed or open.

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1. What are Backflow Preventers?
2. Types of Backflow Devices
3. How to winterize your irrigation backflow device