Abstract: A fitting body seals with a free end of corrugated tubing. The fitting body has an inside opening that tapers inwardly up to the shoulder. A clamping member threads onto the fitting body and engages axially against a split ring that engages between corrugations of the tubing. The fitting body, clamping element and split ring are supplied preassembled. The split ring has an outer diameter that fits in the wider tapering part of the body and an inner diameter that receives the tubing. The tubing is inserted through the clamping member and the split ring and bottoms out against the fitting body. The clamping element is tightened on the fitting body, pulling the split ring axially while cinching it inwardly against the inward taper. This compresses the free end of the tubing against the axial abutment shoulder and achieves a seal.