Valve connections are governed by two different thread standards: British Standard Pipe (BSP) and National Pipe Thread (NPT). Which does your system require?
BSP vs. NPT Fittings: Which Seal Do You Need?
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Connection Between NPT, BSPT and BSP Thread Best Quality SS Tube, Pipe, Valve, Ferrule Fittings Supplier in India
1bn Bsp Male Double Use for 60 Deg Cone Seat or Bonded Seal/NPT Male Tube Fittings - China Parker Tube Fittings, Hydraulic Tube Fittings
How do you identify bsp and npt fitting threads - Espresso Planet Canada
G Thread (BSP) to NPT (US Thread) Pipe Fitting Adapter with G Thread Bonded Washer Seal Included 1/2 MG x 1/2 FNPT 2 Pieces : : Home & Kitchen
NPT vs. BSP Thread Dimensions: A Comprehensive Guide
Main differences between BSPP or Gas, BSPT and NPT threads
Fitting Connection Types: British, German & Japanese