Correct option is C
The
British Standard Pipe (BSP) thread is the standard thread form used for pipes and fittings. It is widely used for connecting and sealing pipes in plumbing and hydraulic systems. BSP threads come in two types:
·
BSPP (Parallel): Used with sealing washers or O-rings.
·
BSPT (Tapered): Seals by thread interference.
BSW - British standard whitworth
BSF - British standard fine
BA - British association.
