If you're the original owner owner of the faucet Moen warrants them to be leak-free for lifetime. I called the 800 number at 1-800-289-6636 and requested a replacement cartridge kit for the faucet (think ours is model 7730). They sent it out no charge in about 10 days.
If your in a hurry you can also buy it from Amazon (Moen 1225 One-Handle Replacement Cartridge).
|Our Moen 7730 Single Handle Kitchen Faucet|
The kit contained everything you need to replace the cartridge and get the faucet working like new again
|1225 Cartridge Repair Kit|
|1225 Cartridge Kit Contents|
Here are the components in the kit:
|Moen 1225 Cartridge|
|Moen 1225 Cartridge Removal Tool|