The working parts of a Sisco cartridge are ceramic, but the body is brass. It screws into the valve seat, much like the stem on a simple-compression faucet.
-
Turn off the water to the faucet. This is most easily accomplished by turning off the angle stops, which are the shut-off valves under the sink cabinet.
-
Pry off the cap on top of the faucet handle with a slot screwdriver. When the cap is removed, unscrew the screw holding the handle on with a Phillips-head screwdriver and remove the handle.
-
Wrap a rag around the nut under the handle to avoid damaging the finish on the faucet, then grip the nut with slip-lock pliers.
-
Turn the nut counterclockwise to loosen it. If it is difficult to turn, remove the rag and spray lubricant on the nut. Give the lubricant about 5 minutes to seep down into the threads. Replace the rag and try turning the nut again.
-
Finish loosening the nut by hand and pull the cartridge out. Take it to a plumbing-supply store to use as a reference for finding a replacement.
-
Insert the new cartridge into the valve seat and tighten it by hand, turning clockwise, until it won't turn any more. Finish tightening it with slip-lock pliers and a rag. Replace the handle, replace and tighten the screw that holds it, then snap the cap back in place.
Things You Will Need
Check out this related video from Homesteady on Youtube.