I have been a customer of Glenn Mechanical for twenty years. They are a great company to do business with. They came out a few weeks ago and replaced a backflow preventer in the water line going to my home, and it is working perfectly. The gentlemen that did the repair were pleasant and professional; they were also on time to start the job. I think they were thorough and complete. I was treated courteously over the phone, and that started everything out with a nice beginning.