I just replace my shower plumbing and now I have low water pressure in the sink and low hot water pressure from my shower everywhere else in the house has good pressure. The lines that go to this bathroom are tied into the others lines that run through the house. The only thing I did is extend the shower lines and I used PVC pipe to extend from galvanized pipe, but I did not touch the sink piping so that is throwing me off now I have low pressure in this bathroom? Please help Thanks.