ANVER Vacuum Cups and Suction Cups Vacuum Cup Fittings – Female-to-Female Connection AdaptersPart Number: HS18-38F Vacuum Fitting Part No. Thru Hole Dia. in. (mm) or Thread Connection Thread Size Hex Size in. (mm) LHeight Added to Assembly in. (mm) HS18-38F 1/8″ NPT female 3/8″ NPT female 0.81 (20.6) 0.98 (25) Material: All-metal, electro-less nickel-plated brass fitting