The device 1, wherein said housing includes {TAIL ~ an outlet connection} communicating with {HEAD ~ said outlet chamber} for connection to a pressure indicator for indicating the pressure in the outlet chamber 
The device 1 , wherein said housing includes { TAIL ~ an outlet connection } communicating with { HEAD ~ said outlet chamber } for connection to a pressure indicator for indicating the pressure in the outlet chamber
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH