Abstract: A coupling for releasably engaging a tubular member has a hollow body, in which the tubular member is received, and a sleeve which is movable axially within the hollow body. The sleeve is provided with an array of spacially separated holes and rotatable gripping members are located in these holes for selectively engaging the outer surface of the tubular member. During insertion of the tubular member into the hollow body, the rotatable gripping members move away from the outer surface of the tubular member. Movement of the tubular member in the opposite direction causes the rotatable gripping members to be cammed into contact with the surface of the tubular member.