Why Hammer Arrestors Matter: Dishwasher & Washing Machine Plumbing Tip

 Water hammer is a common plumbing issue that many homeowners do not notice until they hear banging noises in the pipes.

Water hammer can happen when water flow stops suddenly. This often happens with appliances that have quick-closing valves, such as dishwashers and washing machines.

In this video, I explain why hammer arrestors are important and where they are commonly installed.

Watch the video below:


What Is a Hammer Arrestor?

A hammer arrestor is a small plumbing device that helps absorb shock inside the waterline.

When a dishwasher or washing machine suddenly stops the water flow, pressure can create a shock wave inside the pipe. This is called water hammer.

That shock can cause:

Banging noise
Pipe vibration
Stress on valves and fittings
Stress on appliance hoses
Possible long-term plumbing damage

Why Dishwashers and Washing Machines Need Hammer Arrestors

Dishwashers and washing machines can stop water flow very quickly during operation.

Because of that sudden stop, they are common places where water hammer can happen.

Hammer arrestors help protect the plumbing system by reducing shock and vibration when the water flow stops suddenly.

Common Locations

Hammer arrestors may be installed near:

Dishwasher waterline
Usually under the kitchen sink, connected to the dishwasher hot waterline.

Washing machine waterlines
Usually installed at the laundry shut-off valve box for the hot and cold waterlines.

Why This Matters

A small hammer arrestor can help:

Reduce banging or knocking noise
Protect pipes, valves, hoses, and fittings
Reduce vibration
Help prevent long-term damage
Improve the reliability of the plumbing system

Final Tip

If you hear banging noises when your dishwasher or washing machine stops filling with water, water hammer may be one possible cause.

Do not ignore repeated banging or vibration in the plumbing system. It is better to check the waterlines, shut-off valves, hoses, and hammer arrestors before the problem gets worse.

This post is for general homeowner education. For active leaks, water hammer issues, or plumbing concerns, contact your property manager, strata, or a licensed plumber.

CJ BC Plumbing
Practical plumbing tips for condo owners and homeowners.


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