WaStop® Residential Range – DN110 Non-Return Valves for Homes
The WaStop® Residential Range gives homes and small buildings the same backflow protection as the WaStop® valves used on large outfalls, in a size made for 110mm (4″) domestic drainage. Fitted on the pipe that takes waste water away from the building, it stops sewage backing up into the property when the public sewer surcharges, and stops sewer smells coming back up the drain.
Which residential WaStop® do I need?
| Valve | Where it fits | How it’s installed |
|---|---|---|
| WaStop® Pushfit DN110 | In a shallow inspection chamber outside the home, on the outgoing sewer line | Pushed into the outgoing pipe on the upstream side of the chamber |
| WaStop® Residential DN110 (RSD) | Inline on the sewer lateral, inside or outside the home | A section of pipe is removed and the valve fitted with slide couplings, with an access cover over it |
Why fit a non-return valve to a house drain?
During heavy rain, combined and foul sewers can fill up faster than they drain. When that happens, sewage can be pushed back up the connecting pipes and out through the lowest toilet, shower or gully in the building. A non-return valve on the drain lets waste flow out as normal but closes when flow tries to come back, protecting the property. It is one of the simplest property flood resilience measures available.
Residential WaStop® FAQs
Does it stop smells?
Yes. When closed, the membrane seals against air as well as water, so it stops sewer smells, insects and rats coming back up the pipe.
Does it need power or maintenance?
No power is needed and there are no mechanical moving parts. We recommend checking it during routine drain inspections.
Do you make larger sizes?
Yes. The full WaStop® range runs from DN75 to DN2000.
