Best Backflow Preventer Certification in Bakersfield CA

Do not use them! They don't stand behind their work. Bad people to deal with. Shame on them.  I had Carroll Plumbing install bathroom faucets. About 6 weeks later, I noticed the cold water faucet was loose. I called them back to fix what was an apparently improper installation and they sent me an $86 bill for the recall. When I complained about the bill, they said it was my problem because the faucet requires smaller holes. I said if that was the case why are you telling me this now, why didn't Jay, the owner of the company, who installed them tell me that at the time... before they were installed and I could still return them. They were obviously aware of the problem before they came and before they sent the bill.