Hello… the issue is with my first floor Moen tub/shower single H/C pull handle that was leaking profusely down into the tub as well as behind the wall into the basement. So, I purchased a new "1225" cartridge. I thought it was going to be fairly easy, but it turned out that the cartridge wasn't budging. So, I went back to the store and purchased a "puller" to remove the stubborn cartridge, which surprisingly worked. I then installed the new one and the water stopped pouring out through the single handle. But, after turning the main house water valve back on, a steady water stream started from the faucet below, that I'm now unable to stop. The one thing that I wasn't able to reinstall, was the "retainer clip", because it broke when I forgot about it when pulling out the cartridge. Is that what's causing the "new" leak from the faucet? If not, then I’m at a loss for getting the water to stop. I hope the details helped and didn't confuse anyone. I just didn't want to overlook anything. Thanks in advance for any assistance.