Dynamic bellows fluid fitting

A fitting assembly comprising:

• a first fitting element including a cylindrical body extending around an axis and a wall defining a first bore with a first bore diameter through the first fitting element for allowing fluid to flow through the first bore;
• a sealing element fixed inside the first fitting element, wherein the sealing element is cylindrical with a first end portion having a cylindrical wall fixed in a groove in the first fitting element adjacent the wall defining the first bore, a body portion adjacent the first end portion wherein the body portion has a plurality of undulations and is resiliently axially compressible and includes a second end opposite the first end forming a first sealing surface facing away from the first end portion for sealing against a facing second sealing surface on a second fitting element;
• the second fitting element being movable axially relative to the first fitting element wherein the first fitting and second fitting elements are configured to be joined through relative axial movement of the first and second fitting elements, and having wherein the second fitting element includes a cylindrical body defining a second bore with a second bore diameter through which fluid can pass, the second fitting element including a counterbore defining a larger diameter than the second bore diameter, and wherein the counterbore terminates at the second sealing surface facing the first sealing surface;
• wherein the second fitting element counterbore receives the body portion of the sealing element;
• and
• wherein the first and second fitting elements include facing first and second oppositely-facing surfaces that can come into contact with each other when the first and second fittings join together.