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