As the above indicates. I have a 32mm waste pipe that I would like a non-return valve fitted to as I live in a flood risk area. Are there any options as I can only see 40mm variants or 32-40mm options.
The Hep valve above is good if it is only clean-ish water, water from say a washing machine can have soap sediments which in time can stop it fully closing.
Strongest one I know off can be found on flea bay in the pump macerator section, listed as HD 32-40mm it is around 5" long and can be Black or White, need a 7mm socket to clamp jubilee clips down to 32mm pipe BUT also needs a good pressure to open the valve to let fluid pass through it so without knowing more re the installation wouldn`t recommend it yet.
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