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Inline valves use some type of mechanical obstruction to control or block water flow. Anti-syphon valves use an air gap to prevent siphonage when a backflow condition occurs.
Sprinkler valves can be added to each sprinkler head to better control water pressure. They average $15 per piece.
Costs vary greatly by region (and even by zip code). To get free estimates from local contractors, please indicate yours.