Compression – These are the oldest and most common types of valves. They have a stem held in place with a plastic or rubber washer, which nests into a metal (typically brass) seat. As you turn the knob left, the stem rises and allows water to flow. As you turn the knob right, the stem lowers and pushes the washer into the seat, stopping water flow. These faucets are inexpensive, and there’s a reason for it. The washers often wear out and this causes leaks. They can be quick to repair, but special tools are required. Ball Valve – These types of faucets are usually a one-handle setup. There is a ball with slots, one for hot water and one for cold water, inside the stem. As the handle is turned, water flows through these slots. Controlling the temperature is the result of how much hot and cold water flows from each slot as the handle is turned clockwise and counterclockwise. Water pressure is controlled with the up and down movement of the handle. These are very durable as they don’t require washers to operate.

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