Monthly Archives: October 2020

Installing Non-Return Valves

non-return valve nrv

Non-return valves, allow residents to prevent rats from entering their properties via the sewer. Non-return valves or NRVs are made from plastic, metal or a mixture of both. Stainless steel has proved to be the best material (we don’t like plastic). We’ve used many different types of non-return valve over the years, and we have […]