The seal between the two discs is watertight because they are polished to near-perfect flatness. Ceramic disc faucets are nearly maintenance free and are generally guaranteed not to wear out. If a peeling from galvanized pipe or a small rock got into the valve, it could score the surfaces, but these occurrences are rare. The range of control with a ceramic disc faucet varies. In general, all washerless faucets offer very precise, ergonomic control.
Ceramic discs are popular because of their ease of use and reliability.
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