refrigerant through intake port 17 into the manifold 18 the pressure of the incoming refrigerant measured in pounds per square inch is indicated by intake gauge 29 a similar discharge cut off valve 30 is provided on manifold 18 adjacent the discharge port 20 the discharge pressure gauge 31 meters the discharge flow rate of the outgoing refrigerant a refrigerant port 32 is located on manifold 18 between ports 17 and 20 and is in communication through refrigerant tube 33 with a supply of new refrigerant in container 34 the amount of new refrigerant entering the manifold 18 is controlled by on off valve 35 the device 10 can be of use to air conditioning refrigeration service personnel particularly on systems which do not have pump down capabilities while the refrigerating apparatus 11 continues to operate conduit 14 is connected to the apparatus 11 by means of liquid tube 15 being attached through valve 16 to liquid line 12 and by means of suction tube 26 being connected to suction line 13 through valve 27 some of the high pressure refrigerant passes from liquid line 12 into liquid tube 15 and into manifold 18 through inlet port 17 the flow rate into the manifold 18 may be selectively adjusted by valve 28 the refrigerant passes through outlet.