To prevent foul water flowing back from the blocked sewerage system to flood the property from the inside via toilets, plug holes and waste pipes. These unique and patented Retrofit Non-Return Valves can be simply pushed in to the existing pipework, whether plastic or clay, at the. Non Return valves (NRV’s) automatically close when water or sewage flows back.
Non-Return Valves for foul waste rainwater drainage. Non-return valves prevent discharged water flowing back into your property. Perhaps they have non-return valves fitted?
The rainwater drainage is possibly connected to the foul sewage system if you are in an older area.
Fitting a non-return valve within your drainage system has some . Hunter Plastics Underground Drainage Systems comply with the requirements of. Hunter Non Return Valves, available in . Stop Rats Entering Your Home with our 110mm Non Return Valve – Ratflap,. The video above just shows a selection of our non return valve foul drainage . Our 110mm non return valve are welded using stainless weld and stainless hinge meaning there is nothing within the body for waste to foul on.
