A fitting for use with metal tubing in a jacket, the fitting comprising: an adapter, the adapter having a tubular member defining a longitudinal passage having a longitudinal axis for fluid flow; a body for receiving the tubing, the body bering positioned opposite to the adapter and aligned with the longitudinal axis, the body having a first body end proximate the adapter; a sealing member positioned between the adapter and the body; a retainer positioned external to the sealing member, the retainer receiving the adapter and receiving the body; a first flange located near the adapter and a second flange located near the body; and a fastener for drawing the first flange and second flange towards each other; wherein the fitting further comprising: a ferrule at a second body end of the body, the ferrule configured to engage the jacket of the tubing to mechanically attach the fitting to the jacket characterized in that the ferrule is configured to provide fluid-tight seal between the ferrule and the jacket and between the ferrule and the body, wherein the body includes a frusto-conical annular recess at a distal portion of the second body end of the body, the ferrule being positioned in the frusto-conical annular recess, wherein the frusto-conical annular recess has a recess surface having a first angle (a) relative to the longitudinal axis; and in that the ferrule has a tapered surface, a portion of the tapered surface having a second angle (b) relative to the longitudinal axis, the second angle (b) of the portion of the tapered surface being less than the first angle (a) of the annular recess. an adapter, the adapter having a tubular member defining a longitudinal passage having a longitudinal axis for fluid flow; a body for receiving the tubing, the body bering positioned opposite to the adapter and aligned with the longitudinal axis, the body having a first body end proximate the adapter; a sealing member positioned between the adapter and the body; a retainer positioned external to the sealing member, the retainer receiving the adapter and receiving the body; a first flange located near the adapter and a second flange located near the body; and a fastener for drawing the first flange and second flange towards each other; wherein the fitting further comprising: a ferrule at a second body end of the body, the ferrule configured to engage the jacket of the tubing to mechanically attach the fitting to the jacket characterized in that a ferrule at a second body end of the body, the ferrule configured to engage the jacket of the tubing to mechanically attach the fitting to the jacket characterized in that the ferrule is configured to provide fluid-tight seal between the ferrule and the jacket and between the ferrule and the body, wherein the body includes a frusto-conical annular recess at a distal portion of the second body end of the body, the ferrule being positioned in the frusto-conical annular recess, wherein the frusto-conical annular recess has a recess surface having a first angle (a) relative to the longitudinal axis; and in that the ferrule has a tapered surface, a portion of the tapered surface having a second angle (b) relative to the longitudinal axis, the second angle (b) of the portion of the tapered surface being less than the first angle (a) of the annular recess.