带螺纹的,管外径4/6/8/10/12/14/16 螺纹规格:M5/01/02/03/04/06 直通/三通 :管外径Φ4/6/8/10/12/14/16 管外径Φ4/6/8/10/12/14/16 变径:6-4/8-6/10-8/12-10/8-4/10-6/12-8/16-12/16-14