Cartridge for Faucets: GF-135 GF-135S GF-136 GF-136S High-pressure ceramic cartridge Longevity and trouble-free use Limited lifetime warranty Product Description: If a handle is the muscle of a faucet, then a cartridge is the heart. Every time you turn it on, off, or adjust your water to the perfect temperature, it’s the cartridge, that’s doing all the work. The first single-control hot/cold-water mixing cartridge was invented over 75 years ago. Since then, th