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