A device for use in negative pressure wound therapy comprising: a) a first connection site (807, 907), and b) a connector (330, 630, 806, 906, 1406, 1506) comprising an air inlet fitting (21, 30, 930, 1410) and an air pathway (11, 55, 64) connecting an air outlet fitting (15, 805, 905, 1405, 1505) and the air inlet fitting (21, 30, 930, 1410), wherein the air outlet fitting (15, 805, 905. 1405, 1505) of the connector (330, 630, 806, 906, 1406, 1506) is coupled to the first connection site (807, 907), wherein the connector (330, 630, 806, 906, 1406, 1506) is further selected from: i) a first connector (630, 1506), wherein the air inlet fitting of the first connector (630, 1506) is configured to connect with a first fluid retention source; and ii) a second connector (330, 806, 906, 1406) further comprising a fluid inlet fitting (12, 912) and a fluid outlet fitting (32, 913, 1409) connected by a fluid pathway (33, 54, 934), wherein the air inlet fitting (30, 930, 1410) and the fluid outlet fitting (32, 913, 1409) of the second connector (330, 806, 906, 1406) are configured to connect with a second fluid retention source, and the fluid inlet fitting (12, 912) is configured to connect individually with a transfer dressing or a fluid retention dressing; wherein the first connector (630, 1506) and second connector (330, 806, 906, 1406) interchangeably connect to the first connection site (807, 907) of the device; wherein the device comprises a first compartment (8, 320, 620, 801, 901) and a second compartment (4, 10, 310, 610, 802) connected by the first connector (630, 1506) or the second connector (330, 806, 906, 1406); and wherein the first compartment (8, 320, 620, 801, 901) comprises a source of negative pressure (7, 910) and the second compartment (330, 806, 906, 1406) comprises a power source. a) a first connection site (807, 907), and b) a connector (330, 630, 806, 906, 1406, 1506) comprising an air inlet fitting (21, 30, 930, 1410) and an air pathway (11, 55, 64) connecting an air outlet fitting (15, 805, 905, 1405, 1505) and the air inlet fitting (21, 30, 930, 1410), wherein the air outlet fitting (15, 805, 905. 1405, 1505) of the connector (330, 630, 806, 906, 1406, 1506) is coupled to the first connection site (807, 907), wherein the connector (330, 630, 806, 906, 1406, 1506) is further selected from: i) a first connector (630, 1506), wherein the air inlet fitting of the first connector (630, 1506) is configured to connect with a first fluid retention source; and ii) a second connector (330, 806, 906, 1406) further comprising a fluid inlet fitting (12, 912) and a fluid outlet fitting (32, 913, 1409) connected by a fluid pathway (33, 54, 934), wherein the air inlet fitting (30, 930, 1410) and the fluid outlet fitting (32, 913, 1409) of the second connector (330, 806, 906, 1406) are configured to connect with a second fluid retention source, and the fluid inlet fitting (12, 912) is configured to connect individually with a transfer dressing or a fluid retention dressing; wherein the first connector (630, 1506) and second connector (330, 806, 906, 1406) interchangeably connect to the first connection site (807, 907) of the device; wherein the device comprises a first compartment (8, 320, 620, 801, 901) and a second compartment (4, 10, 310, 610, 802) connected by the first connector (630, 1506) or the second connector (330, 806, 906, 1406); and wherein the first compartment (8, 320, 620, 801, 901) comprises a source of negative pressure (7, 910) and the second compartment (330, 806, 906, 1406) comprises a power source. i) a first connector (630, 1506), wherein the air inlet fitting of the first connector (630, 1506) is configured to connect with a first fluid retention source; and ii) a second connector (330, 806, 906, 1406) further comprising a fluid inlet fitting (12, 912) and a fluid outlet fitting (32, 913, 1409) connected by a fluid pathway (33, 54, 934), wherein the air inlet fitting (30, 930, 1410) and the fluid outlet fitting (32, 913, 1409) of the second connector (330, 806, 906, 1406) are configured to connect with a second fluid retention source, and the fluid inlet fitting (12, 912) is configured to connect individually with a transfer dressing or a fluid retention dressing;