ANVER Vacuum Cups and Suction Cups Vacuum Cup Fittings – Female-to-Male Connection AdaptersPart Number: HS18-38M Vacuum Fitting Part No. Thru Hole Dia. in. (mm) or Thread Connection Thread Size Hex Size in. (mm) LHeight Added to Assembly in. (mm) HHeight in. (mm) HS18-38M 1/8″ NPT female 3/8″ NPT male 0.69 (17.5) 0.19 (4.8) 0.75 (19) Material: All-metal, electro-less nickel-plated brass fitting