The head pipe 1 is {HEAD ~ a cast product} formed of a tubular main body portion 23 and {TAIL ~ the aforementioned supporting portion} 22 integrated together 
The head pipe 1 is { HEAD ~ a cast product } formed of a tubular main body portion 23 and { TAIL ~ the aforementioned supporting portion } 22 integrated together
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH