ANVER Vacuum Cups and Suction Cups Vacuum Cup Fittings – Female-to-Female Connection AdaptersPart Number: HS18-18F Vacuum Fitting Part No. Thru Hole Dia. in. (mm) or Thread Connection Thread Size Hex Size in. (mm) LHeight Added to Assembly in. (mm) HS18-18F 1/8″ NPT female 1/8″ NPT female 0.56 (14.2) 0.75 (19) Material: All-metal, electro-less nickel-plated brass fitting