A fluid coupling includes inner and outer members capable of rotating relative to each other. The inner member includes an inner member interior wall centered about a coupling axis, and a first inner member seal wall centered about the coupling axis and spaced radially outwardly from the inner member interior wall to define a first gap between the inner member interior wall and the first inner member seal wall. The outer member has an outer member exterior wall centered about the coupling axis and surrounding the first inner member seal wall, and a first outer member seal wall centered about the coupling axis and spaced radially inwardly from the outer member exterior wall. The first outer member seal wall is disposed in the first gap to form a labyrinthine seal passage between the inner and outer members.

A quick release coupling for providing a connection between a pair of hydraulic lines is provided. The coupling includes a male component has a fluid passage therethrough and includes a shank portion adapted to engage a first hydraulic line. The shank portion has a first port for establishing fluid communication between the first hydraulic line and the fluid passage. The shank portion also has a restraining mechanism adapted to engage the first hydraulic line and block a rotational movement and an axial movement of the male component relative to the first hydraulic line. The coupling also includes a coupling adapter connectable to the male component and having a fluid channel therethrough adapted to be in fluid communication with the fluid passage. The coupling adapter is adapted to engage a second hydraulic line and has a second port for establishing fluid communication between the second hydraulic line and the fluid channel.

A coupling for providing a connection and establishing fluid communication between fluid lines is provided. The coupling includes a housing defining an internal cavity with an open end, and a male component engageable within the internal cavity through the open end. The male component has a shank portion adapted to engage a fluid line. The coupling also has a nut securable to the housing and adapted to surround a portion of the shank portion and radially and axially restrain the shank portion within the internal cavity. The nut is further adapted to allow the male component to rotate with respect to the housing and the nut about a longitudinal axis of the shank portion. The coupling further includes a sealing ring provided about the shank portion which is adapted to at least partially block axial and radial movement of the male component relative to the nut and the housing.

A coupling for a tube includes an attachment and a housing. The attachment is attached to the tube and has a barrel-shaped exterior surface. The housing contains the barrel-shaped exterior surface such that the attachment is rotatable in the housing while not being removable from the housing. The coupling thereby allows easy rotation of the tube within the coupling. The coupling may be utilized to attach the tube to another tube or to another structure.

A hose assembly (1) including a fluid passage (11), a male coupler (12) and a blocker (13). The fluid passage (11) has an outlet (1112a). The male coupler (12) is rotatably sleeved on the fluid passage (11) at the outlet (1112a). The blocker (13) is protruded from the fluid passage (11) at the outlet (1112a) to restrict detachment of the male coupler (12) from the outlet (1112a) of the fluid passage (11).