Uses a rubber diaphragm or two metal, plastic or ceramic discs with holes that align to let the water flow or close to shut off the water flow. Ceramic plates are more difficult to damage than rubber seats, but hard water can sometimes cause problems with the ceramic cartridges, such as squeaking or sticking.
Single-handle faucets that use stainless steel ball design have just one moving part and are a durable alternative.
Reduces leakage problems that result from worn washers.
Easy to repair because most new models have the water-control mechanism housed in a replaceable cartridge.
Replacing a cartridge is an easy do-it-yourself project, compared to working on conventional faucets. Most faucets that offer this convenience are labeled “self-contained cartridge.”