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