hexagon bushing
/ˈhɛksaɡən ˈbʊʃɪŋ/
n
English · hexagon bushing中文 · 六角异径接头Español · reductor con cabeza hexagonalFrançais · réduction mâle-femelle hexagonale
意味：Fitting with a hexagonal head. It joins two pipes of different diameters: one pipe is screwed onto the male end, and the other into the female end.