The transition or reducing nipple is used to connect two pipes of different diameters.
It is also used for small diameter pipes to improve fluid flow.

Size, G 1/2″x1/4″ 1/2″x3/8″ 3/4″x1/2″ 1″x1/2″ 1″x3/4″ 1-1/4″x1″ 1-1/2″x1/2″ 1-1/2″x3/4″ 1-1/2″x1″ 1-1/2×1-1/4″ 2″x3/4″ 2″x1″ 2″x1-1/4″ 2″x1-1/2″
Weight, g 25 32 56 84 86 145 152 168 170 183 253 257 273 258
A, mm 24 25 27 31,5 31,5 37 37,5 38 40 40 38,5 41 41 42,5
Working pressure, bar up to 40 up to 25
Body material KF.N0608.WN Brass CW617N
KF.N0206-KF.N1620 Brass CW617N nickel plated