Dan V. did a great job of removing an old under sink reverse osmosis system with a new unit. He was on time, did a thorough evaluation of the job and offered a very fair estimate for the work required on the spot. Throughout the replacement process he was extremely neat and efficient. He even detected a small, unrelated leak in the drain system and repaired it just to make sure everything under the sink was "right." Overall, I couldn't be happier with the results -- I'll be sure to call on Dan and Hays Plumbing to perform the annual servicing on the unit next year. Thanks for a great job!