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