Irregular shapes may also be chosen so as to accommodate {TAIL ~ features}, such as {HEAD ~ external fittings} or fluid control devices 
Irregular shapes may also be chosen so as to accommodate { TAIL ~ features } , such as { HEAD ~ external fittings } or fluid control devices
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH