{TAIL ~ The filter body} is designed with a propeller shape and has two blades connected by an axle of {HEAD ~ the filter} 
{ TAIL ~ The filter body } is designed with a propeller shape and has two blades connected by an axle of { HEAD ~ the filter }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD