FIG 4c is {TAIL ~ an optional third mounted position} which may be included for further operating convenience since the present valve offers no manual means for closing the valve means when in the second mounted position, the significance of which will be described below in greater detail with regard to {HEAD ~ operation} of the device 
FIG 4c is { TAIL ~ an optional third mounted position } which may be included for further operating convenience since the present valve offers no manual means for closing the valve means when in the second mounted position , the significance of which will be described below in greater detail with regard to { HEAD ~ operation } of the device
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH