Vacuum interface valves are available in .53 and 1.32 gallons. The tank of .53 gallon unit (upper picture on the left) is made of polypropylene and the tank of the 1.32 gallon unit (lower picture on the left) is made of corrosion resistant AISI 316. Both of the vacuum interface valves include proven Evac pneumatic flush mechanism with flush memory and vacuum sensor technology. No electricity is needed. Vacuum interface valves consist of simple, reliable components with easy, time-saving and cost-effective maintenance. Evac supplies the interface valves with a lifetime support and spare parts supply.