A male swivel hose coupling includes a hollow tail piece having a receiving portion and a stem and a hollow collar having a threaded portion. The collar is received over the receiving portion and is freely rotatable with respect to the receiving portion. The receiving portion of the tailpiece includes a rim and a shoulder, and the collar includes a lip and a shoulder. The rim of the receiving portion forms a first stopping surface for engaging the lip and the shoulder of the receiving portion forms a second stopping surface for engaging the shoulder of the collar.

A coupling for joining two pipes, such as casing joints includes opposed ends having threads for engaging threaded ends of the respective pipes and a generally centrally located corrugated section, which provides the coupling with a degree of flexion in response to lateral stresses or loads.

A universal quick-connect hose kit for a fluid system includes an adapter configured for coupling to the fluid system, a flexible hose for coupling to the adapter, and union nuts mounted on respective ends of the flexible hose, The union nuts are each arranged to rotatably couple the adapter to a respective end of the flexible hose.