A multi-profile adapter assembly (10, 100, 200, 300) for connecting a pressurized fluid source to different shaped access fittings in an air conditioning system, the adapter assembly comprising: an injector connector (12, 312) including a connector housing with an outer port on one end for removably attaching to a pressurized fluid source, an inner port on another end and an internal conduit extending between the outer port and the inner port for channeling a flow of pressurized fluid from the outer port to the inner port; an inner housing (14, 314) connected to the injector connector, the inner housing including a first opening (38, 314A), a main chamber that communicates with the first opening on one side and a restriction channel on the other, the restriction channel extending from the main chamber to a second opening (45, 314B), the second opening including a cavity configured to receive an access fitting on an air conditioning system; a one way valve located in the injector and/or the inner housing for permitting pressurized fluid flow from the conduit in the injector connector into the inner housing; and an adapter (18, 118, 318) with two spaced apart sidewalls (60, 120, 318A, 318B) and a bottom connecting the sidewalls, the inner housing being located between the sidewalls, the adapter including a first contour configured to engage with a portion of a first access fitting of an air conditioning system and a second contour configured to engage with a portion of a second access fitting on an air conditioning system, where the first and second access fittings have different sizes or shapes; and wherein the inner housing and adapter are movable relative to one another for changing the location of the first contour and second contour relative to the cavity of the inner housing depending on whether the adapter assembly is configured to connect to the first access fitting or the second access fitting. an injector connector (12, 312) including a connector housing with an outer port on one end for removably attaching to a pressurized fluid source, an inner port on another end and an internal conduit extending between the outer port and the inner port for channeling a flow of pressurized fluid from the outer port to the inner port; an inner housing (14, 314) connected to the injector connector, the inner housing including a first opening (38, 314A), a main chamber that communicates with the first opening on one side and a restriction channel on the other, the restriction channel extending from the main chamber to a second opening (45, 314B), the second opening including a cavity configured to receive an access fitting on an air conditioning system; a one way valve located in the injector and/or the inner housing for permitting pressurized fluid flow from the conduit in the injector connector into the inner housing; and an adapter (18, 118, 318) with two spaced apart sidewalls (60, 120, 318A, 318B) and a bottom connecting the sidewalls, the inner housing being located between the sidewalls, the adapter including a first contour configured to engage with a portion of a first access fitting of an air conditioning system and a second contour configured to engage with a portion of a second access fitting on an air conditioning system, where the first and second access fittings have different sizes or shapes; and wherein the inner housing and adapter are movable relative to one another for changing the location of the first contour and second contour relative to the cavity of the inner housing depending on whether the adapter assembly is configured to connect to the first access fitting or the second access fitting.