Vacuum Cups and Suction CupsVP50 Rigid and Port Mount Series Complete Pad Number Replacement Seal Number Cup Diameter in. (mm) Cup Height in. (mm) Mounting Style Vacuum Port Size Rated Load lb. (kg) VP50-2-CR SSR-50 5.13 (130) 1.70 (44) Rigid* 1/4″NPT 80 (36) * Note: The Rigid Mount has a (1/2 – 13 UNC) blind tapped suspension hole with 1/4″NPT side port for vacuum.