This post is based on our original pdf about winterizing irrigation systems.
Winter Shutdown Procedure
- Close the main supply/shutoff valve (marked in blue.)

- Open all 1/4″ ball valves on the backflow preventer.

- Turn ball valves on the backflow preventer to a 45 degree (or less) angle.

- Open all drains in the main line and in the valves boxes (marked in green).

- Open all bleed screws on the valves or turn all solenoids to the “ON” position.

- Turn clock to the “off” position.

- Cover the backflow preventer with a backflow blanket.

- Check the hose bib to be sure you did not turn off the house water supply!
- Your house main is marked in red.