Vacuum Cups and Suction Cups Vacuum Cup Fittings – Female-to-Male Connection AdaptersItem No.: HS14-38M Part No. Description L in. (mm) H in. (mm) Fitting Material HS14-38M Reducing Bushing 3/8″ NPT – male to 1/4″ NPT – female 0.87 (22) 0.75 (19) Electro-Less Nickel-Plated Material: All-metal, electro-less nickel-plated brass fitting Available Vacuum Suction Cups that use Fitting No. HS14-38M (Click images below for more information)