Plumbing and maintenance
Plumbing in a washing machine or dishwasher properly
What to check
- Self-cutting saddle valves on an existing
- pipe are a frequent source of slow weeps; a properly teed-in appliance valve with a compression joint is the durable answer.
- The waste hose needs a trapped standpipe or a spigot on a trapped waste
- hooking it into an open gully or an untrapped branch is what causes drain smells in a utility.
- Leaving the hose in a high loop above the
- level of the drum prevents dirty water siphoning back into the appliance mid-cycle.
Where jobs go wrong
The waste hose needs a trapped standpipe or a spigot on a trapped waste, hooking it into an open gully or an untrapped branch is what causes drain smells in a utility.

Common questions
Why does the machine smell of drains?
Usually an untrapped or dried-out waste connection letting sewer air back through the standpipe rather than anything wrong with the machine.
Can an appliance share a waste with a sink?
Yes, through a spigot on the sink trap, provided the trap seal is intact and the hose is fixed at the correct height.
Other guides you may want
Working out what is realistic in your space?
Room dimensions, the position of the window and where the waste leaves the building decide most of it. Send those and we can be specific.