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A backflow-prevention device safeguards the water line from the nonpotable water in the irrigation system, and in fact, this is required by many local codes throughout the country. Start by digging a hole around the water meter. A 2'-by-2' hole should be sufficient for most water mains. Carefully expose the water-main pipe and fittings, then call a professional to handle the installation.
The backflow-prevention device is threaded onto the main line and is tightened securely with a pipe wrench.
On the other end of the backflow preventer, the master control valve (Image 1) is threaded on using Teflon (c) tape. First cut a small piece of 1" poly pipe about 12" long. Using a stainless-steel clamp, crimp the clamp tightly down onto the control valve. Slide clamps onto the main pipe and zone pipe. Slide a T-coupler (Image 2) into the main and zone pipes and onto the control-valve pipe. Crimp all clamps down securely (Image 3). Since this is a critical junction in the irrigation system, using two clamps per section is recommended.
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