A fitting for use with metal tubing includes an adaptor, the adaptor having a longitudinal passage having a longitudinal axis for fluid flow; a body for receiving the tubing, the body positioned opposite the adaptor and aligned with the longitudinal axis; a metal sealing member positioned between the adaptor and the body; a nut positioned opposite the body; a jacket lock ring positioned radially inwardly of a portion of the nut, the jacket lock ring for making a mechanical connection with an outer jacket of the tubing; and at least one fastener coupling the nut, body and adapter.