Patent ID: 7350831

Claim:
An end structure for a water pipe having a pipe main body made of a synthetic resin, the end structure comprising an annular metal inner piece inserted into an end of the pipe main body, and a connector including a connecting cylindrical portion connected to the pipe main body with the pipe main body inserted into the connecting cylindrical portion, the connecting cylindrical portion including a connection having an engagement portion, wherein said inner piece has its diameter increased from the inside of the pipe main body while the pipe main body is open to the outside so as to form a radially outward swollen portion in at least a part of that portion of the pipe main body which corresponds to the inner piece, the swollen portion engaging the engagement portion to connect the pipe main body to the connecting cylindrical portion so that the pipe main body is locked on the connecting cylindrical portion, wherein the inner piece is a cylinder having first and second axial ends opposite to each other, wherein the inner piece has a flange portion extending radially outward at the first axial end, the flange portion having an outer diameter larger than the inner diameter of the pipe main body so that the flange portion contacts an end surface of the pipe main body when the inner piece is inserted into the pipe main body, and wherein the flange portion is tapered so that the outer diameter of the flange portion decreases toward the first axial end.