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