The present invention relates, in some embodiments thereof, to devices, systems and methods for establishing a fluid passageway between vessels. In some embodiments, the invention provides a system for the engagement and establishment of fluid passageway between vessels, the system comprises a first vessel comprising a valve； and a second vessel configured to be coupled to the first vessel； wherein the second vessel comprises a valve unlock mechanism configured to unlock/open the valve, and wherein at about the time of or following the engagement between the first and second vessels, the valve unlock mechanism unlocks/opens the valve, allowing a fluid transfer between the vessels.
