A therapy system for providing instillation therapy and negative-pressure therapy, the system comprising: a pump having a pump inlet and a pump outlet, the pump configured to draw fluid into the pump inlet and move fluid out of the pump outlet; a fluid source; characterized in that the system further comprises an adapter coupled to the pump and the fluid source, the adapter comprising: a therapy conduit configured to be fluidly coupled on a first end to the pump and on a second end to a canister; a housing having a fluid inlet configured to be fluidly coupled to the fluid source, a fluid outlet configured to be fluidly coupled to a dressing, and a pressure inlet fluidly coupled to the therapy conduit; a moveable barrier disposed in the housing to form a dosing chamber and a pressure chamber, the dosing chamber and the pressure chamber fluidly isolated from each other, the fluid inlet and the fluid outlet in fluid communication with the dosing chamber, and the pressure inlet in fluid communication with the pressure chamber; and a check valve fluidly coupled to the therapy conduit and the pressure inlet; and a selector valve fluidly coupled to the pump inlet and the pump outlet and configured to be fluidly coupled to the therapy conduit, the selector valve having a first position fluidly coupling the pump inlet to the therapy conduit and a second position fluidly coupling the pump outlet to the therapy conduit. a pump having a pump inlet and a pump outlet, the pump configured to draw fluid into the pump inlet and move fluid out of the pump outlet; a fluid source; characterized in that the system further comprises an adapter coupled to the pump and the fluid source, the adapter comprising: a therapy conduit configured to be fluidly coupled on a first end to the pump and on a second end to a canister; a housing having a fluid inlet configured to be fluidly coupled to the fluid source, a fluid outlet configured to be fluidly coupled to a dressing, and a pressure inlet fluidly coupled to the therapy conduit; a moveable barrier disposed in the housing to form a dosing chamber and a pressure chamber, the dosing chamber and the pressure chamber fluidly isolated from each other, the fluid inlet and the fluid outlet in fluid communication with the dosing chamber, and the pressure inlet in fluid communication with the pressure chamber; and a check valve fluidly coupled to the therapy conduit and the pressure inlet; and a therapy conduit configured to be fluidly coupled on a first end to the pump and on a second end to a canister; a housing having a fluid inlet configured to be fluidly coupled to the fluid source, a fluid outlet configured to be fluidly coupled to a dressing, and a pressure inlet fluidly coupled to the therapy conduit; a moveable barrier disposed in the housing to form a dosing chamber and a pressure chamber, the dosing chamber and the pressure chamber fluidly isolated from each other, the fluid inlet and the fluid outlet in fluid communication with the dosing chamber, and the pressure inlet in fluid communication with the pressure chamber; and a check valve fluidly coupled to the therapy conduit and the pressure inlet; and a selector valve fluidly coupled to the pump inlet and the pump outlet and configured to be fluidly coupled to the therapy conduit, the selector valve having a first position fluidly coupling the pump inlet to the therapy conduit and a second position fluidly coupling the pump outlet to the therapy conduit.