→ Back to all articles
Water Pressure & Quality
What Causes a 'Knocking' Sound in the Pipes When a Tap Is Closed?
This phenomenon is called "water hammer," and it happens when water flow stops suddenly (by closing a tap or a fast valve), causing the pressure wave inside the pipes to rebound and strike their walls, producing an audible knocking sound. It's usually caused by a missing or weak air chamber in the plumbing, or excessively high water pressure in the network.