A fitting for coupling with a pipe in a sour environment comprising: a coupling body having an inner surface defining a bore for receiving the pipe therein at at least one end thereof; a ring positioned to fit over the at least one end of the coupling body for mechanically connecting said coupling body to said pipe; a main seal formed on the inner surface of the coupling body; an inboard seal formed on the inner surface of the coupling body spaced inwardly from the main seal and the at least one end of the coupling body; an outboard seal formed on the inner surface of the coupling body spaced inwardly from the at least one end of the coupling body and outwardly from the main seal; a transition section (24, 26) is formed as an indentation on the inner surface of the coupling body adjacent the main seal, said transition section (24, 26) having a first portion with a first diameter and a second portion with a second diameter, with the first diameter being greater than the second diameter, characterized in that: when said ring is fitted over the at least one end of the coupling body via force, the ring and coupling body apply a coupling force to the main seal, the outboard seal and the inboard seal sufficient to cause permanent deformation of the pipe to thereby connect the pipe to the coupling body in a non-leaking manner; wherein the main seal includes a first main seal, a second main seal, and a third main seal, with grooves being positioned between each of the first, second, and third main seals (50, 52, 54); wherein the first main seal is spaced inwardly from both of the second and third main seals (52, 54); and wherein the first main seal is positioned on the inner surface of the coupling body at a first seal diameter, the second main seal is positioned on the inner surface of the coupling body at a second seal diameter, and third main seal is positioned on the inner surface of the coupling body at a third seal diameter, with the first seal diameter being greater than the second and third seal diameters. a coupling body having an inner surface defining a bore for receiving the pipe therein at at least one end thereof; a ring positioned to fit over the at least one end of the coupling body for mechanically connecting said coupling body to said pipe; a main seal formed on the inner surface of the coupling body; an inboard seal formed on the inner surface of the coupling body spaced inwardly from the main seal and the at least one end of the coupling body; an outboard seal formed on the inner surface of the coupling body spaced inwardly from the at least one end of the coupling body and outwardly from the main seal; a transition section (24, 26) is formed as an indentation on the inner surface of the coupling body adjacent the main seal, said transition section (24, 26) having a first portion with a first diameter and a second portion with a second diameter, with the first diameter being greater than the second diameter, when said ring is fitted over the at least one end of the coupling body via force, the ring and coupling body apply a coupling force to the main seal, the outboard seal and the inboard seal sufficient to cause permanent deformation of the pipe to thereby connect the pipe to the coupling body in a non-leaking manner; wherein the main seal includes a first main seal, a second main seal, and a third main seal, with grooves being positioned between each of the first, second, and third main seals (50, 52, 54); wherein the first main seal is spaced inwardly from both of the second and third main seals (52, 54); and wherein the first main seal is positioned on the inner surface of the coupling body at a first seal diameter, the second main seal is positioned on the inner surface of the coupling body at a second seal diameter, and third main seal is positioned on the inner surface of the coupling body at a third seal diameter, with the first seal diameter being greater than the second and third seal diameters.