A two-piece fitting for corrugated tubing having a body and one or more snap rings. Each snap ring is securely housed within the body near an opening to an inner area of the body. A plurality of first and second slots can extend in opposing directions through a ring wall of the snap ring. The first slots can, at least in part, define ring fingers having retention projections, and which are configured to provide an inwardly directed spring force at least at a first end of the snap ring. The second slots extend into at least some of the ring fingers, and can provide a second end of the snap ring with a generally outwardly directed spring force. An inner surface of the snap ring can be outwardly tapered at the second end of the snap ring to reduce the force used to insert the tube through the snap ring.