Wall Mounted Single Lever Bathtub Mixer With Diverter

"Valve" is a nicely ambiguous term. Technically, a plumbing valve is any device that turns water flow on and off. "A faucet is a "valve" Within the generally accepted use of the term but not all valves are faucets. A faucet also contains a valve — meaning that component of the faucet that actually regulates water flow, as distinct from other parts of the faucet such as the body, spout, handle, etc. that do not. To add further to the confusion, a faucet "valve" is often confused with a faucet "cartridge" and the two terms are frequently used interchangeably. A cartridge is a housing for a valve, in fact, it is often called a "valve cartridge" to distinguish it from other types of cartridges. But, while a cartridge always contains a valve, a valve is not always contained within a cartridge. Many faucets still have valves that are built into the faucet body itself rather than into a removable cartridge. An outside spigot or hose Bibb, for example, is likely to have an old-style compression valve that is built into the faucet body.