Just a word of caution, if you remove the 'vacuum breaker' and do not replace, you may in violation of the law if and when you decide to sell your house. As noted above, the repair or rebuild of a valve is easily done once the water is shut off. i have done this several time, and have never had to revmove the valve body. Even had to replace the valve seat twice, the valve body remained.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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