Not only is Mark quite knowledgeable , his prices are extremely Fair. You will not get that in another plumber, Guaranteed!
I, like a previous Yelp poster have also recommended Mark out, one of those people, my boss, and the owner of the company I work for. Needless to say, my boss has used him multiple times on rental houses.
You owe it to yourself to call Mark. You will not be disappointed, I promise.