Inline backflow and flood prevention valve

A Wastop backflow valve is a patented device that helps to prevent backflow in drains. Not only does it provide flood protection, but it also helps to eliminate the chance of insects, small animals, and flotsam getting into the pipe. It can also help to prevent odours from escaping from the pipeline.

The Wastop inline backflow and flood prevention device is a unique patented valve that protects your pipes from backflow and flood. It can be installed at either the inlet or outlet and is designed for most pipe sizes up to 1800mm. Its patented design prevents infiltration of small animals, insects, flotsam, and gasses into your pipeline.

This device is particularly effective at protecting your property from coastal flooding, which is common in Charleston’s low-lying areas. With sea level rise, the frequency and severity of these flooding events is increasing. Backflow prevention devices are a great solution for dealing with tidal flooding. These valves prevent seawater from backing up into your drainage system, and they allow stormwater to drain when the tide is receding.

Stainless steel option

The stainless steel version of the WAPRO Wastop backflow valve has many advantages over its earlier fabricated steel counterpart. It is lighter and more cost-effective to manufacture. It also allows for more complicated shapes and larger hollow sections. The next material to become popular was plastic. Early versions used plastic bodies with bronze shut off valves.

The WaStop Stainless Steel series is available in DN 100 to 1800mm. It is designed to fit inside existing pipes and can be installed in vertical and horizontal applications. It can be installed on either the inlet or outlet of a sewer or stormwater system. Its inline design makes installation a snap.

Memory membrane design

The Memory Membrane is a key component to the Wastop’s effectiveness. This special elastomer is inserted into the pvc or stainless steel pipe, providing exceptional chemical resistance and shape retention. This ensures that the valve opens and seals immediately whenever backflow occurs.

The Wastop’s unique design works to prevent backflow, prevent flooding and keep sewage odor from spreading. It is easily installed in any existing pipe and is available in standard and custom sizes. It can also be mounted in a chamber or through flanges, making it incredibly flexible.


One of the benefits of a WaStop backflow valve is its durability. This valve is designed to be highly resilient and has a lifespan of 20 to 25 years. In addition to its longevity, it also has excellent chemical resistance and shape retention. It is a high-quality, low-cost option for your backflow prevention system. In addition, the WaStop backflow valve is easy to install and has minimal maintenance requirements.

Backflow in storm and sewer networks is a huge concern because of the damage that can be caused. It can also pose a health risk. Thus, it is vital to ensure that backflow prevention devices are autonomous and never rely on human action, which is often risky in times of severe storms. The WaStop backflow valve is a perfect example of a self-reliant backflow prevention device.


A WaStop backflow valve is one of the most effective backflow preventers on the market. It is installed in either horizontal or vertical pipes and prevents backflow by blocking the flow of gas or water. The device works by utilizing an elastic cone to close when backflow occurs, preventing backflow from affecting the flow of the water or gas. The device is also highly effective at blocking the spread of odours and other contaminants.

A WaStop backflow valve consists of a pipe and a special elastomer sleeve. The pipe can be made of stainless steel or plastic. The sleeve is made from a specially formulated elastomer that features exceptional chemical resistance and shape retention. This sleeve is designed to resist pressures up to several meters in the opposite direction. It seals instantly to prevent backflow.