For example, any other kind of {TAIL ~ register} may be used in lieu of {HEAD ~ the butterfly valve registers}, for instance the slide valve type 
For example , any other kind of { TAIL ~ register } may be used in lieu of { HEAD ~ the butterfly valve registers } , for instance the slide valve type
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH