ANVER Vacuum Cups and Suction Cups Vacuum Cup Fittings – Group 2 Part Number: HS8 Vacuum Fitting Part No. Thru Hole Diameter in. (mm) Connection Thread Size H Height in. (mm) HS8 0.20 (5.1) M8 (8mm) male 0.79 (20) Material: All-metal, electro-less nickel-plated brass fitting Available Vacuum Suction Cups that use Fitting No. HS8 The HS8 Group 2 Fitting can be used with many different Vacuum Suction Cups (too many to list here). Click this page of cups Larger Cups (21 mm – 165 mm) and look for this image for available cups: