ANVER Vacuum Cups and Suction Cups Vacuum Cup Fittings – Female-to-Female Connection AdaptersPart Number: HS6-18F-G Vacuum Fitting Part No. Thru Hole Diameter in. (mm) or thread Connection Thread Size Hex Size in. (mm) LHeight Added to Assembly in. (mm) HS6-18F-G* 0.2 (5) M6 (6 mm) female to G1/8″ female 0.51 (13) 0.51 (13) * Must be ordered with HS6 if mounting to ANVER Cup Material: All-metal, electro-less nickel-plated brass fitting