I just replaced the 1225 cartridge in my leaking Moen single handle faucet and it works great. The problem I have now is the nozzle on my spray hose leaks when I turn the faucet on and when diverting the water from the faucet spout to the sprayer (by pressing the button on the sprayer) the water will come out of the sprayer but also through the spout (at reduced pressure.) Did I do something wrong when I inserted the new cartridge? This is my first DIY project. Is it fixable by replacing the spray hose or will I need to take the cartridge back out and replace it again? I read that I may need to clean the diverter valve. Where will I find the valve?

What I think has happened here is when you replace the cartridge you disturbed some crud built up in the valve body where it is now clogging the demerger. The solution would be to remove the handle and pull up on the spout so that it comes off. In front is the diverter, remove it and clean the opening. Now turn the water on for a minute to flush everything out. Reassemble and test. Better now? Good luck, Tom