Vacuum Cups and Suction Cups Vacuum Cup Fittings – Female-to-Male Connection AdaptersPart No. HS18-18M-G Part No. Description A Male Connection Thread B Female Connection Thread Hin. (mm) Lin. (mm) SW (Hex) Fitting Material HS18-18M-G Adapter, G 1/8″ – male to 1/8″ NPT – female G1/8″ 1/8″ NPT 0.24 (6) 0.67 (17) 0.55 (14) Electro-Less Nickel-Plated Brass with Black Plastic Washer The “G” thread is also known as BSPP, commonly used world-wide for Vacuum Applications. Material: All-metal, electro-less nickel-plated brass fitting