The one way membrane is secured to {HEAD ~ the sealing element} rather than formed as {TAIL ~ an integrated part} of the nozzle body 
The one way membrane is secured to { HEAD ~ the sealing element } rather than formed as { TAIL ~ an integrated part } of the nozzle body
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH