Tube joint for fuel tank

A tube joint for a fuel tank comprising:

• a tank body;
• a tubular joint body formed of a material which is weldable to the tank body;
• a barrier layer covering an inner surface of the joint body, the barrier layer being formed of a material which has fuel impermeability and a predetermined hardness, the barrier layer having an extension portion extending from a distal end of the joint body along an axial direction of the joint body, the extension portion including a projecting portion which protrudes radially outward of the extension portion at or adjacent to a proximal end of the extension portion;
• a seal groove defined by an area formed between a proximal surface of the projecting portion of the barrier layer, an outer peripheral surface of the distal end of the joint body, and a distal surface of a projecting portion of the joint body;
• and
• a nail portion which protrudes radially outward of the extension portion at or adjacent to a distal end of the extension portion.