Also, {TAIL ~ the head pipe} is formed at its front surface or its both sides of its tubular main body portion with an opening in order to reduce {HEAD ~ the weight} 
Also , { TAIL ~ the head pipe } is formed at its front surface or its both sides of its tubular main body portion with an opening in order to reduce { HEAD ~ the weight }
OTH OTH TAIL 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 HEAD HEAD HEAD HEAD HEAD HEAD