Leaking kitchen faucet

The valve cartridge needs replaced. Those can be purchased at most home improvement stores, such as Home Depot. Or, it may be under warranty.

http://www.moen.com/replacement-parts/search

You can find it on amazon here: Save on Kohler Innovative Cimarron Toilet. Hope this was helpful. cheers

Replace the cartridge

you must use genuine kohler parts,if you got something from lowes or home depot that was some other brand they usually leak. also look for calcium build up inside the valve body,you can use 1500 grit wet sand paper to remove it just be carefull and dont sand too much,then apply water proof plumbers grease inside the valve body befor you install the new cartridge.

The single handled faucets have a valve cartridge which needs to be replaced when it leaks. Disassemble the handle to find the valve inside. Take the valve to the hardware store to be sure you get the right one and reassemble. To disassemble, pop the cap off the lever, unscrew the single screw, then use slip-joint pliers to loosen the retainer nut. lift the cartridge out with pliers taking note of the direction of the notch at the top of the stem. Be sure to reassemble with the notch facing in the same direction. You should replace and lubricate the O-rings when you change the valve cartridge.
Since you have the numbers for that particular faucet, you might want to call around to find the cartridge first. Different models have different valves, so be sure yours is correct.

Replace o rings.

Single or dual lever? A new ball if single lever. Home Depot or Menards will carry them. Teflon tape if dual cartridge. Stay away from moving parts

Most Price Phister valve cartridges have a plastic washer or "O" ring at the base of the cartridge, where it screws into the valve body. Replacements should be available at H/Depot, Lowe's/similar.
Regards, --W/D--

try puting boiling hot water on the bottom of handle push down on the handle then pull up .

the pic u have up doesnt show it being a pull out u trying to fix airater?