Valentyn replaced the mixing valve on hot water tank and he did an outstanding job. He was extremely responsive: he was on the phone asking for details before I'd even got off the computer with my initial query. When he came to my house (exactly at the time he said he would), he was clear in describing what the problems with my system were and laying out and discussing my options. As to the work itself, he was fast and unobtrusive, Valentyn did very high quality work, and left the work area clean and tidy. He also did a great job checking in with me regularly regarding progress. All in all, a very positive experience. I'd happily use Drain Com services again and I strongly recommend them.