ANVER Vacuum Cups and Suction Cups Vacuum Cup Fittings – Female-to-Female Connection Adapters Part Number: HS18-38F Vacuum Fitting Part No. Thru Hole Dia. in. (mm) or Thread Connection Thread Size Hex Size in. (mm) L Height Added to Assembly in. (mm) Item Weight oz. (grams) HS18-38F 1/8″ NPT female 3/8″ NPT female 0.81 (20.6) 0.98 (25) 1.587 (45) Material: All-metal, electro-less nickel-plated brass fitting