The present invention relates to valve system ports, and particularly to those ports used in {HEAD ~ refrigeration systems} for charging and evacuating {TAIL ~ the refrigerant system} with refrigerant 
for evacuating
The present invention relates to valve system ports , and particularly to those ports used in { HEAD ~ refrigeration systems } for charging and evacuating { TAIL ~ the refrigerant system } with refrigerant
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH