It may be preferential that electrical conductors and other elements passing through {TAIL ~ a portion} of a hollow interior of the tubular body have a combined cross sectional area that is less than 40% of the cross sectional area of the hollow interior of the tubular body to reduce {HEAD ~ flow impedance} 
It may be preferential that electrical conductors and other elements passing through { TAIL ~ a portion } of a hollow interior of the tubular body have a combined cross sectional area that is less than 40 % of the cross sectional area of the hollow interior of the tubular body to reduce { HEAD ~ flow impedance }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD