International Valve Marketing presents catalogues on its Vent-O-Mat air release vacuum break valves. These valves offer a solution to surge problems. Protection by Vent-O-Mat valves aims to provide benefits associated with initial filling, pump trip conditions, pipeline operating and surge protection. Vacuum protection is a built-in integral part of each valve. Valves are all stainless bodies, and range in size from 1″ to 8″ as standard. Larger sizes are available.