rigid member 12 second tubing interface 25 is located between sleeve interface 23 and first tubing interface 21 and includes seal groove 32 and shoulder 34 second tubing interface 25 has an outer diameter approximately equal to the outer diameter of sleeve 16 second tubing interface 25 continues axially from shoulder 19 to shoulder 34 where the diameter increases to maximum diameter 15 the diameter of second tubing interface 25 is sized so as to fit within and in close relationship with the inner diameter of a second tubing section 36 as shown in fig2 rigid member 12 is constructed from a material suitable for use with the coiled tubing string rigid member 12 may be constructed from metallic materials such a steel stainless steel high chrome steel or other machinable weldable material the inside diameter of rigid member 12 which forms flow passage 13 may include sloped ends 40 where the diameter gradually increases in order to provide a smooth transition and eliminate any internal ledges the overall length of rigid member 12 is minimized so as to reduce the stiffness of connector 10 as the length of rigid member 12 increases the stiffness of connector 10 and the stress developed in the coiled tubing string also increase sleeve 16 is a relatively thin walled tubular member that is constructed from a material suitable for use with the coiled tubing string sleeve 16 has an outer diameter sized so as to fit in close relationship with the inner diameter of second tubing section 36.