that was suppose to say Ok, so I know there's a lot of post probably on this topic but this has a slight difference to it... I re-did the tile in my shower and took down the walls etc. I had a (way overpriced...400.00 for a 45 minute install)plumber come in and install a new facet, piping and shower head. Before I had him come that shower never squealed ever! No matter what. Then I started noticing if water ran anywhere else in the house AFTER his install the thing would squeal a little for about 10 seconds. Well I just installed a new shower head that has a regular head and one mounted to a line. You can also turn them both at the same time...well of course this would create a similar pressure situation as when other water is running, so this baby is squealing like a pig when I turn them both on. When I called to complain (as they said I had a warrenty)...they said they only gar. the connections and also since I provided the equipment (it was brand new though) they would not come back and fix it without charging me a min. fee of 59.50 + whateve cost to fix. Now she said they would refund if they found it to be there problem on the install, but if it a defective part (etc) it was mine they would not. Now I guess that's not a bad deal, but these people ripped me off once before, I don't want to engage in another situation where they say "your fault and here's the costs...you already owe me 59, do you want me to fix." What could be causing the sound and what's the chances it's the part vs. bad install. Any help is appreciated please.