My Manabloc was corroding and showed signs of leakage. I got two estimates and went with the lower one, from Jenni Plumber. Doug replaced the Manabloc and did a great job. The Manabloc was in a difficult place to get at, so there was some discussion about cutting out drywall. Turned out Doug was able to do the job by cutting a small piece of wood from underneath, a great relief–no drywall work needed! And because it took him less time than estimated, the cost came in BELOW estimate, which was welcomed! I would definitely recommend Jenni Plumber–they seem to have very experienced and trustworthy people. Also, Sammy, the young lady who deals with customers by phone, is a delight to deal with.