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Non-return 
Non-return
valve manufactured from brass. BSP thread on all screw threads.
Made in Italy
1/2 inch Male &
3/8 inch Male BSP thread
The British Standard Pipe (BSP) is a family of standard screw
thread types that has been adopted internationally for interconnecting and sealing
pipe ends by mating an external (male) with an internal (female) thread and has
been adopted as a standard scale used in plumbing fittings.
