On April 30, I called Cassidy Plumbing for the 1st time. Teressa asked me about my plumbing problem, I said, our Toto Toilet would not stop filling. Terresa said technician Chris will be over in the afternoon. Chris arrived, solved the toilet filling issue. As he was flush testing the toilet, Chris asked if I heard the pipes hammering? I said yes, they do that regularly. Chris asked to test the water pressure in the house and found the pressure was very HIGH.Chris suggested he remove, clean, adjust and reattach the pressure relief valve. He did and the valve would not lower the water pressure in our house. So we had Chris install a new pressure relief valve. When Chris was done, he kept the panel open for me to check the valve the next morning. I checked, the new valve was damp (a very tiny leak). I called Cassidy Plumbing and another technician arrived with an apprentice who is learning the craft. They removed the new valve. Checked it and reseated it. Again, leaving the panel off for me to check in the morning. Well, it was damp (still leaking). I called, and Teressa sent Chris back. When he checked the new valve, Chris found the new valve had a hair line crack. So, a new, new pressure relief valve was installed and, it works just fine! And our pipes do not hammer. Through the three visits, the Cassidy Plumbing "Team" did everything needed to solve our problem. We are very pleased to have found Cassidy Plumbing to handle all our plumbing needs.