UNN - Solder type nut and nipple

Solder type nut and nipple pipe ends supplied in sets - one nut and one nipple - in various sizes:
1/8" BSP for 1/8" or 3/16" pipe
7/16" x 19 TPI for 3/16" pipe
1/4" BSP for 1/4" or 5/16" pipe
3/8" BSP for 3/8" pipe
1/2" BSP for 1/2" pipe