>>  接头           K-12 　 Socket (Coupling) Banded           K-12A 　 Socket (Coupling) Banded Reducing           K-12B 　 Socket (Coupling) Plain           K-12C 　 Half Socket (Coupling) Plain           K-12D 　 Socket (Coupling) Weld O. D. Machined           K-12E 　 Socket (Coupling) O.D.Machined           K-12F 　 Socket (Coupling) Weld O. D. Machined           K-12G 　 Socket (Couping) Banded Reducing Weld           K-12I 　 Socket (Coupling) Weld Plain           K-12J 　 Half Socket (Half Coupling) Weld Plain           K-12K 　 Hexagon Socket (Coupling) Plain 弯头/三通/四通| 活接头| 内接头| 管堵头| 接头| 金属软管| 快速接头| 快插接头