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