Non Return Isolating Ball Valves

Non Return Isolating Ball Valves by AVG

The NRI's from AVG is the perfect twin function valve widely used when installing appliances. The non-return & isolating valve provides two important functions;

1. It is an isolating valve isolating the incoming mains water from the appliance, a typical usage would be the installation of a hot water tank allowing easy service of the hot water heater without isolating the properties water supply completely.
2. It is a non-return valve prevents water returning back up the supply line.