British Standard Pipe (BSP) is a standardized type of thread that has been adopted worldwide, which unit is expressed in inches. The only exception is in the United States where NPT (National Pipe Thread) supplant BSP.
Major part of SAFI valves can be equipped with BSP threaded ends, male (external thread) or female (internal thread). BSP threaded adaptors are available with GRPP material and available from DN 1/2" (15mm) to 3" (80mm).
SAFI provides various accessories such as bulkhead fittings with BSP threaded end and cap and/or lock nut, camlock GRPP adaptors female or male BSP threaded, GRPP couplers female or male BSP threaded...
See too: butterfly valve.