Abstract: A coupling arrangement (10) including a first coupling (12?) and a second coupling (16), the first and second couplings being connectable to form a joint (12). Each of the first and second couplings defines a passage through which fluid can flow and the respective passages are in alignment when the first and second couplings (12?, 16?) are connected. Each of the first and second couplings (12?, 16?) includes first and second interconnecting coupling parts (20, 60) in which the first coupling part defines the passage. The second coupling part (60) is connectable to the first coupling part (20) and to a first coupling part of another coupling to form the joint. The first and second couplings (12?, 16?) are coupled together by a releasable connection between the second coupling part (60) of each coupling with the first coupling part (20) of the mating coupling.