an interface connector is provided for connecting homogenous spacecraft cells . the interface connector includes at least one male valve assembly and at least one female valve assembly . the male valve assembly includes an extendable and retractable piston having a central conduit . the female valve assembly has a central bore closed by a ball valve . preferably , the male and female valves are positioned so that extension of the piston engages the ball valve so as to create a fluid pathway . various components in the male and female valve assemblies are electrically conductive to allow the transmission of power and data . further , the male valve assembly is constructed to function as a propulsion thruster when not mated to a female valve assembly .