The constant worry is over.. No more freezing hose bib, just a clean piece of steel.
I had been mulling over how I was going to make my outdoor shower frost free to include speaking with several plumbers who did not know of a solution. I watched a UTube video of a plumbing tech show in Las Vegas and saw that it is what I needed as I have a swim spa and we have below freezing temperatures often in the winter months. Like to shower before and after getting into the swim spa.
This replacement fixed the hammer issue at two spigots that I was experiencing. Though I could not detect any visual difference between existing and new replacement vacuum breaker, once replaced the spigot worked again properly.