We just gutted our bathroom and had to replace some of the cooper lines, this has been a job. Now our upstairs sink has no water pressure, we are still in the process of installing the new shower hardware and the shower will not shut off, it drizzles. What could we have done to the sink upstairs, it is the kitchen sink. The dishwasher still works fine and the upstairs bathroom has great water pressure. Can anyone help me.

YUP... hope so. Start with removing the aerator (screen assembly) at the end of the kitchen spot. Remove and clean this, then run water to really clear spout.. then re-install aerator.. If this fixed it.. super. If not... get back to us and we will try something else.

IF my answer helped please RATE THIS ANSWER by clicking on button below. Thank you.

We did this last night and it did not work.

Does this effect both hot and cold at sink? Is this a single handle or two handle faucet?

Single handle and it affect both hot and col

OK. Then... shut off shutoffs under sink. Then remove single handle and try to remove the cartridge assembly from under nut (under handle). Then after cartridge is out you will need to cover faucet with rag and pulse the shutoffs under sink and see if you can flush debris/scale/deposits, etc. from inside faucet lines.

Even if you see nothing, do this and then set cartridge back into place, tighten all and try to turn water back on.. did this do it? Also, clean cartridge... look at this.. anything in screens, etc. Try this and get back to me.

PS.. if you touch shutoffs... when finished tighten the packing nut gently to assure yourself of no leaks at these valves in future.

Okay as soon as I get home I will try this hope it works if not I will post again tomorrow. Thanks