The seal also acting to retain {TAIL ~ the valve member} within {HEAD ~ the housing} and in which the housing defining end portions which extend axially away from the valve member at any position of the valve member between the open and closed positions 
The seal also acting to retain { TAIL ~ the valve member } within { HEAD ~ the housing } and in which the housing defining end portions which extend axially away from the valve member at any position of the valve member between the open and closed positions
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH