Okay, I have delta faucet in a rental house, it was working FINE when I left. A few months later (a few ago) my renters said the water pressure had went down, now it's to the point it will only dribble out. I told him to replace the valve. He went to Lowes and purchased a new one, it didn't work at all. I told him to turn it around and then it started dribbling. When he has the valve removed and turns on water to the house, only cold water flows out the right side, there is no hot water coming out the left side. I had him open and close the shutoff screws. I had him pull out the "stop" following this and he did and reinserted it. http://www.moen.com/shared/docs/instruction-sheets/mt620j.pdf I do not believe we have balancer in this unit as I believe that is contained in the valve and not the body.... Is that normal for no hot water to flow? There is a shower unit behind this so ... < 5ft a way that shower has hot water... I'm really puzzled at this point. The house has a fantastic softner/arsenic remover, so I'm just confused what else could be going on here? I have attached pictures of the valve body and the valve. He says it's a delta monitor unit. It is a bath only unit with no shower. I think this is the right picture for this faucet. http://www.deltafaucet.com/customersupport/documentation/1323.html?document=pd&fromDetailArea=bath&documentIndex=0#flashWrapper When I did my new delta install I had a similar issue but it was only because I didn't have it seated 100% it was REALLY hard to get it all the way in. I could really use some ideas on other things to check.