{HEAD ~ The interior} of housing 2 on the spring 24 side of diaphragm 7 is vented to {TAIL ~ the atmosphere} by a bore 30 formed through pin 26 
is vented to
{ HEAD ~ The interior } of housing 2 on the spring 24 side of diaphragm 7 is vented to { TAIL ~ the atmosphere } by a bore 30 formed through pin 26
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH