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Screw this into your hose spigot as the first item in your starting line-up. Most city codes require it, because it prevents backflow (created by negative line pressure), which can cause contamination of your water source, especially if you are injecting fertilizers into your drip system. (FHT x MHT)
I used this vacuum breaker as shown in the catalog irrigation diagram and it worked great!Review by Katie (on 12/19/12)