Vacuum interface units are used when gravity based appliances, such as wash basins, sinks and urinals, are connected to a vacuum sewage system. Vacuum interface valves are available in 2 and 5 litre versions. The tank of the 2 litre unit (upper picture on the left) is made of polypropylene, and the tank of the 5 litre unit (lower picture on the left) is made of corrosion resistant AISI 316.
