Accordingly, the present invention provides an inner drive that is more resistant to swelling once {HEAD ~ the process fluid} has permeated {TAIL ~ the plastic shell} 
permeated
Accordingly , the present invention provides an inner drive that is more resistant to swelling once { HEAD ~ the process fluid } has permeated { TAIL ~ the plastic shell }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL