Pipe joint

A pipe joint comprising:

• a first thin-walled pipe having a first end provided with a first thread portion, said first thread portion being formed with a first thread portion wall which has a thickness substantially identical to the thickness of the wall of said first thin-walled pipe, said first thin-walled pipe including a first inner portion which is formed axially inward from said first thread portion and which at least partially conically decreases towards said thread portion and means for engagement by a holding tool;
• a second thin-walled pipe having a second end provided with a second thread portion adapted to matingly receive said first thread portion, said second thread portion being formed with a second thread portion wall which has a thickness substantially identical to the thickness of the wall of said second thin-walled pipe, said second thin-walled pipe including a conically enlarged portion formed axially outward from said second thread portion and an annular extension provided adjacent said conically enlarged portion;
• and
• a seal ring arranged to be received in said annular extension and to be tightened between said extension of said second thin-walled pipe and said first inner portion of said first thin-walled pipe when said extension and said inner portion move toward one another during threaded connection of the first and second thin-walled pipes.