Vacuum Cups and Suction Cups Vacuum Cup Fittings – Female-to-Male Connection Adapters Part No. HS34-34M-G Part No. Description A Male Connection Thread B Female Connection Thread H in. (mm) L in. (mm) SW (Hex) Item Weight oz. (grams) Fitting Material HS34-34M-G Adapter, G 3/4″ – male to 3/4″ NPT – female G3/4″ 3/4″ NPT 0.63 1.78 1.38 6.526 (185) Zinc-Plated Steel with Sealing Washer The “G” thread is also known as BSPP, commonly used world-wide for Vacuum Applications. Zinc-Plated Steel with Sealing Washer