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