Hi--
I replaced the moen cartridge, single lever, kitchen. The first time it started leaking after a few days. I took it out, flushed out the water line, reinstalled and now leaks as soon as I turn the water on. I looked inside the tube (?) and saw some corrosion. Could that be the problem? Should I try replacing the o-rings?
Thanks,
Mike

Did you lube the "O" rings with Silicon Jel when you installed the cartridge?
Check the "P" rings. Are any rolled out of position?

Quote:

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saw some corrosion

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clean off any corrosion that's in the valve body and try again. Good luck. Tom

You may also have made or just got a small nick in an O ring. If Tom's suggestion of silcone jel doesn't fix it just call Moen for free replacement and start fresh, they give you some jel with the cartridge.

I was having the same issue. After removing it for the third time to return it. I was staring at it for while and realized that the end where the handle attaches to (brass end) was pushed in just a little bit leaving a gap in the holes that are covered by the Rubbers on the sides. I just pushed the other end back in (pushed the cartridge back in place) and it was good to go. Make sure u use the plastic installation tool that is provided so u don't inadvertently push it out of place by pushing in on the brass end. No more drip!