Does the rule of having the back siphon be at least 6" higher than the sprinkler head also apply to the hose bib? I would guess so but cannot find anything to back it up.
been a standard for quite a while & many new have internal designed
install vacuum breakers at all exterior threaded hose bibs & sillcocks
#12](http://www.watts.com/pages/faq.asp?catId=65&faqId=6#50)
http://www.plumbinghelp.ca/images/Hose%20bib%20vacuum%20breaker.jpg
duh… why didn’t I remember that? Guess at 46 I am already having a senior moment. Thanks Mr. Adair…