A method of forming a pipe or tube connecting section 1, comprising {HEAD ~ the additional step} of pressing {TAIL ~ the form} between complementary male and female dies to form the two channels 
of pressing
A method of forming a pipe or tube connecting section 1 , comprising { HEAD ~ the additional step } of pressing { TAIL ~ the form } between complementary male and female dies to form the two channels
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH