Patent ID: 8523242

Claim:
A connection-structure of a flexible tube, in which said flexible tube is tightly fitted to an outer surface of an end portion of a metal pipe, comprising: an annular projection that is formed on said outer surface of said end portion of said metal pipe, said annular projection circumferentially extending over a whole circumference of said metal pipe; a first radially enlarged portion that is formed on a tip side of said metal pipe relative to said annular projection, said first radially enlarged portion defining a first annular groove with said annular projection; a seal ring that is fitted into said first annular groove; and a second radially enlarged portion that is formed on a base side of said metal pipe relative to said annular projection, said second radially enlarged portion defining a second annular groove with said annular projection; a tip portion of said flexible tube being positioned on said second radially enlarged portion and close to a maximum diameter portion of said second radially enlarged portion.