A port arrangement comprising - a fluid module incorporating ∘ a first port arranged to receive a first connector, wherein the first port comprises a first tube and a first interior wall concentric with the first tube, the first interior wall provides a first circumferential space around the first tube, the first port further comprises a first seat extending from the first interior wall to form a front end of the first port; ∘ a second port arranged to receive a second connector, wherein the second port comprises a second tube and a second interior wall concentric with the second tube, the second interior wall provides a second circumferential space around the second tube, the second port further comprises a second seat extending from the second interior wall to form a front end of the second port; ∘ a bypass channel connecting the first circumferential space and the circumferential second space; - a door comprising a first seal and a second seal arranged to an inner wall of the door, wherein the door is arranged to be positioned in a closed position against the fluid module, wherein the first seal and the second seal are positioned to the inner wall such that in the closed position the first seal abut against the first seat and the second seal abut against the second seat to thereby seal the first circumferential space and the second circumferential space. - a fluid module incorporating ∘ a first port arranged to receive a first connector, wherein the first port comprises a first tube and a first interior wall concentric with the first tube, the first interior wall provides a first circumferential space around the first tube, the first port further comprises a first seat extending from the first interior wall to form a front end of the first port; ∘ a second port arranged to receive a second connector, wherein the second port comprises a second tube and a second interior wall concentric with the second tube, the second interior wall provides a second circumferential space around the second tube, the second port further comprises a second seat extending from the second interior wall to form a front end of the second port; ∘ a bypass channel connecting the first circumferential space and the circumferential second space; ∘ a first port arranged to receive a first connector, wherein the first port comprises a first tube and a first interior wall concentric with the first tube, the first interior wall provides a first circumferential space around the first tube, the first port further comprises a first seat extending from the first interior wall to form a front end of the first port; ∘ a second port arranged to receive a second connector, wherein the second port comprises a second tube and a second interior wall concentric with the second tube, the second interior wall provides a second circumferential space around the second tube, the second port further comprises a second seat extending from the second interior wall to form a front end of the second port; ∘ a bypass channel connecting the first circumferential space and the circumferential second space; - a door comprising a first seal and a second seal arranged to an inner wall of the door, wherein the door is arranged to be positioned in a closed position against the fluid module, wherein the first seal and the second seal are positioned to the inner wall such that in the closed position the first seal abut against the first seat and the second seal abut against the second seat to thereby seal the first circumferential space and the second circumferential space.