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Draw the main line from the location where your plan to install your control valves, time (if automatically operated), and backflow preventer. Draw branch lines from the main line to each head. You can route a branch line to more than one head if you use a 3â4 inch (1.9 cm) pipe, but two should be the limit.
Shopping for a sprinkler system: 1  When giving an estimate, a contractor generally provides a plan diagram and usually plants small flags in the ground indicating what type of sprinkler heads (popup, inground, directional) will go where. 2  The Irrigation Association lists tips for hiring a contractor.