There are different types of non return valve, which vary in price and skill required to install. The first thing to identify is the size of the pipe leading from your property to the drainage system. As a simple guide:

  1. Residential properties – 110mm drain non return valves
  2. Commercial properties – 150 mm drain non return valves

N.B. you may have more than one pipe leading to the drainage system.

The next step is to determine where you can install a drain non return valve. The easiest place to start is to look around your property for an inspection chamber, and lift the lid. If you are unable to remove lid yourself, please contact a drainage expert to help you. If you have an inspection chamber, count the number of in pipes into the chamber and assess the size of each pipe. In this case, you can install a retro fit non return valve. No tools are required and can be installed in minutes.

Non Return Valves

If you do not have an inspection chamber, then you will need to install an inline non return valve. The type of inline non return valve will depend on whether you are preventing storm or saline water. Although inline non return valves operate with a single flap like a retro fit non return valve, the issue is they require expertise to install. The works may involve digging down, cutting the pipe and installing the valve.

WaStop Stainless Steel Inline Installation