I have a small dilemma and I am wondering if I am going to need to call in a plumber.
I am planning to blowout my sprinklers at the end of the season on my own and I thought I would do a little research to make sure I am doing it right. Through the various blogs and the how-tos I have discovered that you must not blow out your sprinklers through the backflow preventer because it will melt the rubber gaskets. This makes complete sense, however, when I refer to the setup I have at home I have found that the hose bib (where I have planned to connect my air hose) is before the backflow device which essentially means that I will be blowing air up through the backflow and down the line to the sprinklers. On top of that I will be forcing air down the main waterline, although closed inside the house, it is still a concern that the constant air might do some damage.
So my question is... am I OK to blowout my sprinklers as is or am I going to need to call in a plumber to remove the hose bib and move it so it is after the backflow device?
Thanks for any help people can provide to me.