Review on Moen 4000 Faucet Cartridge: Enhance Your Faucet's Performance with the Ultimate Replacement Part! by Mark Kolipano

Repairing my Moën kitchen faucet with this item was very easy. All I needed was a pair of pliers and an allen wrench. View every 5 minutes. After I installed the new element, the faucet was still leaking a little. I took it apart again and found that the old gasket (the blue Mickey Mouse thing in the picture) had come loose from the old valve and was still there. Doh! Pulled it out, checked that the new valve still had a seal, put it all back together and it was like new. If you have a leak, check if you forgot the old gasket.