a y - port device including a valve positioned proximally to the fluid channel thereby eliminating aberrant currents and dead space within the y - port device . the valve is a septum and penetrable by a probe . the valve is positioned such that the external end may be cleaned and / or sanitized prior to penetration by a probe and the internal end abuts the fluid channel of the device such that dead space is eliminated between the flow path and the internal end of the valve . the y - port device ensures that an entire infused bolus is flushed from the interior of the y - port and into the desired vascular system .