Vacuum Security Valve Isv-M4 for Maintenance of Vacuum If One or More Suction Cups with in a Group Fail to Make Contact with The Workpiece. Size=M4, Ejector Pulse Suitability=<= 8 bar, Assembly Position=Any, Operating Pressure=-0, 95 - 0 bar, Required Suction Rate at-0.5 bar=1 L/Min, Festo