A medical pump system for enteral feeding, comprising: (i) a disposable system portion, comprising: a plurality of disposable inlet tubes (31, 32) connected to a plurality of fluid bags containing feed material (41, 42); a disposable fluid chamber having at least two intake openings connected to the inlet tubes, sealed by at least one intake valve, and an outlet opening sealed by an outlet valve; the disposable fluid chamber includes a piston for performing reciprocating movement which is sealing said fluid chamber, wherein said piston is connected to a non-disposable drive mechanism via a plunger rod having a first connector which holds a reciprocating drive bracket of said non-disposable drive mechanism and transfers reciprocal motion of said non-disposable drive mechanism, said non-disposable drive mechanism pulls said piston to draw fluid from one of said at least two intake openings and pushes said piston to discharge said fluid into said outlet opening, wherein the disposable fluid chamber and said plurality of disposable inlet tubes are detachable from a housing; and (ii) a non-disposable reusable portion, comprising: a reusable console with a control unit, the non-disposable drive mechanism, the reciprocating drive bracket including a second connector configured for holding the first connector of the plunger rod, the housing, and a selecting valve enclosing at least two inlet tubes, each providing fluid to one of said at least two intake openings, wherein said selecting valve closes one of said at least two inlet tubes while opening another of said at least two inlet tubes, wherein the selecting valve is not in contact with fluid in the at least two inlet tubes, wherein the control unit controls the non-disposable drive mechanism, and the control unit controls the selecting valve, wherein the first connector and second connector enable a quick mounting and removal of the disposable fluid chamber from the reusable console. (i) a disposable system portion, comprising: a plurality of disposable inlet tubes (31, 32) connected to a plurality of fluid bags containing feed material (41, 42); a disposable fluid chamber having at least two intake openings connected to the inlet tubes, sealed by at least one intake valve, and an outlet opening sealed by an outlet valve; the disposable fluid chamber includes a piston for performing reciprocating movement which is sealing said fluid chamber, wherein said piston is connected to a non-disposable drive mechanism via a plunger rod having a first connector which holds a reciprocating drive bracket of said non-disposable drive mechanism and transfers reciprocal motion of said non-disposable drive mechanism, said non-disposable drive mechanism pulls said piston to draw fluid from one of said at least two intake openings and pushes said piston to discharge said fluid into said outlet opening, wherein the disposable fluid chamber and said plurality of disposable inlet tubes are detachable from a housing; and a plurality of disposable inlet tubes (31, 32) connected to a plurality of fluid bags containing feed material (41, 42); a disposable fluid chamber having at least two intake openings connected to the inlet tubes, sealed by at least one intake valve, and an outlet opening sealed by an outlet valve; the disposable fluid chamber includes a piston for performing reciprocating movement which is sealing said fluid chamber, wherein said piston is connected to a non-disposable drive mechanism via a plunger rod having a first connector which holds a reciprocating drive bracket of said non-disposable drive mechanism and transfers reciprocal motion of said non-disposable drive mechanism, said non-disposable drive mechanism pulls said piston to draw fluid from one of said at least two intake openings and pushes said piston to discharge said fluid into said outlet opening, wherein the disposable fluid chamber and said plurality of disposable inlet tubes are detachable from a housing; and (ii) a non-disposable reusable portion, comprising: a reusable console with a control unit, the non-disposable drive mechanism, the reciprocating drive bracket including a second connector configured for holding the first connector of the plunger rod, the housing, and a selecting valve enclosing at least two inlet tubes, each providing fluid to one of said at least two intake openings, wherein said selecting valve closes one of said at least two inlet tubes while opening another of said at least two inlet tubes, wherein the selecting valve is not in contact with fluid in the at least two inlet tubes, wherein the control unit controls the non-disposable drive mechanism, and the control unit controls the selecting valve, wherein the first connector and second connector enable a quick mounting and removal of the disposable fluid chamber from the reusable console. a reusable console with a control unit, the non-disposable drive mechanism, the reciprocating drive bracket including a second connector configured for holding the first connector of the plunger rod, the housing, and a selecting valve enclosing at least two inlet tubes, each providing fluid to one of said at least two intake openings, wherein said selecting valve closes one of said at least two inlet tubes while opening another of said at least two inlet tubes, wherein the selecting valve is not in contact with fluid in the at least two inlet tubes, wherein the control unit controls the non-disposable drive mechanism, and the control unit controls the selecting valve, wherein the first connector and second connector enable a quick mounting and removal of the disposable fluid chamber from the reusable console.