Description: Tube Couplings are manufactured by using steel and stainless steel material. Tube couplings sizes are available from 6 to 42 mm in light series as well as 6 to 38 mm in heavy series. It has an outer housing with an internal bore, an O-ring fitted within the bore, a spacer bushing fitted against the O-ring and a gripper ring fitted against the axially outer side of the spacer ring. The gripper ring having axially and radially inwardly protruding circumferentially spaced gripping teeth, the teeth arranged for providing a twist when subjected to simultaneous rearward axial and rotational forces. The type of couplings include tube coupling parts, tube to tube coupling, tube to male stud BSPT, tube to male stud BSP, tube to male stud metric, tube to male studelastomeric BSP, tube to male stud elastomeric metric, tube to male stud O-ring metric, tube to male stud NPTF, tube to male stud O-ring SAE/UNF, bulkheads, weld coupling, female connector BSP and female connector metric.