Coupling, Pipe Fitting, Pneumatic fittings, brass fittings, one touch fittings, push ... , speed controller,silencer CouplingWe are professional supplier of Hydraulic fittings,Industrial hose fittings, BSP Adaptors,Flare Fittings, ORFS Adaptors with a ... durability4. Dependable ball-locking mechanism holds the mating halves together5. Socket and plug are precision machined from solid bar stock