DeVilbiss Hose Fittings are designed to provide a lasting leakproof contact between the hose and the equipment and allow attachment to the spray gun or other device. The two most common types of connections used are the standard (or threaded) and the quick detachable types. In the majority of cases, both employ the compression ring principle of attachment to the hose. The compression ring is normally a split brass ring. Regardless of the type of ring used, both employ the same principle of design and perform the same function.