1,Air Coupler,Quick Release Couplings,Quick Connect Couplings,Air Accessories 2,Size:BSP1/4F 3,Material:Brass ARO Interchange Couplings generally are used in maintenance or repair applications and have an instantaneous, spring actuated valve inside the socket portion of the couplings. This stops flow from one end of the line when the connection is broken, usually from the supply end.