Patent ID: 6851723

Claim:
A ring joint, comprising: a ring joint body having: a fitting hole for an eyebolt, the fitting hole being piercingly formed in an axial core portion of said ring joint body and in continuation from an annular recessed groove formed inside the ring joint body, and a flow path communicating with the fitting hole and extending in a direction perpendicularly intersecting with an axial core of the fitting hole; and a branch pipe formed as a unitary body with the ring joint body and arranged in a direction perpendicular to and intersecting with the eyebolt for insertion to the annular recessed groove, wherein the ring joint is formed of resin at least at the branch pipe, wherein the ring joint can be connectable with a piping by inserting the piping into the branch pipe of the ring joint body, wherein the piping has an outer peripheral surface covered with resin at least at a portion contacting to the branch pipe, and wherein the piping is fixedly welded to an inner peripheral surface of the branch pipe via the resin of the outer peripheral surface of the piping.