ANVER Vacuum Cups and Suction Cups Vacuum Cup Fittings – Female-to-Male Connection AdaptersPart Number: HS18-12M 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) HS18-12M 1/8″ NPT female 1/2″ NPT male 0.88 (22.4) 0.37 (9.5) 1.00 (25.4) Material: All-metal, electro-less nickel-plated brass fitting