ANVER Vacuum Cups and Suction Cups Vacuum Cup Fittings – Female-to-Female Connection AdaptersPart Number: HS18-12F Vacuum Fitting Part No. Thru Hole Dia. in. (mm) or Thread Connection Thread Size Hex Size in. (mm) LHeight Added to Assembly in. (mm) HS18-12F 1/8″ NPT female 1/2″ NPT female 0.94 (23.9) 1.18 (30) Material: All-metal, electro-less nickel-plated brass fitting