A connector section for connecting two components of a fluid transfer apparatus to each other, said connector section comprising: i. a cylindrical, hollow outer body; ii. a connection port adapted to connect to a first fluid transfer component, said connection port located on the outside of said outer body at its proximal end; iii. a needle holder located on the inside of said outer body at its proximal end; iv. a needle that functions as a fluid conduit, wherein said needle passes through and is rigidly attached to said needle holder, the distal end of said needle comprises at least one port that allows fluid communication between the outside and the inside of said needle; v. a single membrane seal actuator reciprocally displaceable within the hollow interior of said connector section; said single membrane seal actuator comprising: - a cylindrical actuator casing; - a distal membrane that seals the distal end of said casing, wherein a part of said distal membrane protrudes distally from said casing; and - at least one resilient arm which is connected at a proximal end thereof to an intermediate portion of the exterior of said casing and comprises enlarged locking elements at its distal end; said enlarged locking element having specifically shaped surface areas which interact with an inner wall of said hollow cylindrical outer body of said connector section to enable a four step procedure for connecting or separating said connector section to a second fluid transfer component (15, 228); said connector section characterized in that said single membrane seal actuator comprises a rigid plastic needle valve seat located proximally of said membrane, said needle valve seat comprising a bore, wherein said bore is adapted to allow said needle to be pushed back and forth through it and at least a portion of each of said bore is adapted such that fluid cannot pass through said portion when said needle is at least partially located in said portion of said bore; wherein, said connector section is configured to allow a head portion of said second fluid transfer component (15, 228) to enter the interior of said connector section and to allow said single membrane actuator to be pushed proximally when said membrane at its distal end is contacted by a membrane (15a, 234) located in said head portion of said second fluid transfer component; whereupon further pushing of said membranes (34b, 15a, 234) together causes said distal end of said needle to exit the distal end of said bore and to penetrate said membrane in said single membrane actuator and to penetrate said membrane (15a, 234) in said head portion, thereby establishing a fluid channel via said needle between said connection port and the interior of said second fluid transfer component (15, 228). i. a cylindrical, hollow outer body; ii. a connection port adapted to connect to a first fluid transfer component, said connection port located on the outside of said outer body at its proximal end; iii. a needle holder located on the inside of said outer body at its proximal end; iv. a needle that functions as a fluid conduit, wherein said needle passes through and is rigidly attached to said needle holder, the distal end of said needle comprises at least one port that allows fluid communication between the outside and the inside of said needle; v. a single membrane seal actuator reciprocally displaceable within the hollow interior of said connector section; said single membrane seal actuator comprising: - a cylindrical actuator casing; - a distal membrane that seals the distal end of said casing, wherein a part of said distal membrane protrudes distally from said casing; and - at least one resilient arm which is connected at a proximal end thereof to an intermediate portion of the exterior of said casing and comprises enlarged locking elements at its distal end; said enlarged locking element having specifically shaped surface areas which interact with an inner wall of said hollow cylindrical outer body of said connector section to enable a four step procedure for connecting or separating said connector section to a second fluid transfer component (15, 228); - a cylindrical actuator casing; - a distal membrane that seals the distal end of said casing, wherein a part of said distal membrane protrudes distally from said casing; and - at least one resilient arm which is connected at a proximal end thereof to an intermediate portion of the exterior of said casing and comprises enlarged locking elements at its distal end; said enlarged locking element having specifically shaped surface areas which interact with an inner wall of said hollow cylindrical outer body of said connector section to enable a four step procedure for connecting or separating said connector section to a second fluid transfer component (15, 228);