What is the role of a washer or gasket in a cold water pipe joint?

• A. To seal joints and prevent leaks, ensure proper fit and avoid overtightening.
• B. To increase water temperature.
• C. To reduce water flow.
• D. To protect pipes from corrosion.

Answer: (A)

A washer or gasket in a cold water pipe joint provides a compressible seal between the mating surfaces, filling gaps and irregularities so the joint can be tightened to stop leaks. It helps distribute the force from tightening so the joint seats evenly and you don’t overtighten, which can damage threads or fittings. Materials are chosen for water resistance and low-temperature performance, keeping the seal reliable under normal cold-water conditions. The other options don’t fit because a gasket doesn’t raise temperature, decrease flow, or primarily protect against corrosion.