The cartridge https://www.nivito.com retaining nut is another common cause of leaks in pull out kitchen faucets. When this nut is loose, the faucet is likely to leak water. Using an adjustable wrench, tighten it. Once it is tightened, turn the water back on and check the faucet for leaks around the cartridge. If it’s loose, you can remove the cartridge and replace it. If the leak persists, you can try replacing the nut with a new one.