A bush is a type of threaded fitting. It is a nut or sleeve that has an outside thread for a larger diameter connection and an inside thread for a smaller diameter connection.
Purpose:
– Joining pipes of different diameters.
– Replacement of damaged threads by drilling. A larger hole is drilled in the part, a new thread is cut and a socket is screwed in.

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 17 31 77 53 103 294 259 204 100 254 390 292 212
A, mm 16 16 17.5 20 20 20,5 24,5 24,5 25,5 25,5 24,5 24,5 24,5 24,5
Operating pressure, bar up to 40 up to 25
Body material KF.F0608.WN Brass CW617N
KF.F0206-KF.F1620 Brass CW617N nickel plated