Vacuum Components and AccessoriesG – Male to NPT – Female Adapters Product Photo (Click to Enlarge) Part No. Description A Male Connection Thread B Female Connection Thread Hin. (mm) Lin. (mm) SW(Hex) Fitting Material Optional G (BSPP) Straight Thread Hose Barbs 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 Coming Soon HS14-14M-G Adapter, G 1/4″ – male to 1/4″ NPT – female G1/4 1/4 NPT 0.31 (8) 0.87 (22) 0.67 (17) Electro-Less Nickel-Plated Brass with Black Plastic Washer HS38-38M-G Adapter, G 3/8″ – male to 3/8″ NPT – female G3/8 3/8 NPT 0.45 (11) 1.37 (35) 0.94 (24) Zinc-Plated Steel with Sealing Washer HS12-12M-G Adapter, G 1/2″ – male to 1/2″ NPT – female G1/2 1/2 NPT 0.52 (13) 1.70 (43) 1.12 (28) Zinc-Plated Steel with Sealing Washer HS34-34M-G Adapter, G 3/4″ – male to 3/4″ NPT – female G3/4 3/4 NPT 0.63 (16) 1.78 (45) 1.38 (35) Zinc-Plated Steel with Sealing Washer Coming Soon The “G” thread is also known as BSPP, commonly used world-wide for Vacuum Applications.