A plunger mounted in {HEAD ~ the casing} for {TAIL ~ free vertical movement} within a selected range has a disc like foot positioned for free engagement by the diaphragm 
for
A plunger mounted in { HEAD ~ the casing } for { TAIL ~ free vertical movement } within a selected range has a disc like foot positioned for free engagement by the diaphragm
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH