Backflow preventors are a vital part of the irrigation system. It's safeguards against contaminated water, whether pesticides or any other dirt and grime backing up into your main water supply.
This video explains how to build a backflow prevention port into your existing irrigation system. It's an excellent example whether your pipe lines are pvc or poly. All fittings to transition from brass to the various types of pipe can be found at your local hardware store.
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