Abstract: A multiple-line connective device for use in a medication infusing system includes a connective device body forming a main flow passage from an inlet to an outlet along a longitudinal axis, the main flow passage including an interior surface having a raised surface feature configured to induce turbulent liquid flow through the main flow passage. One or more branches extend from the connective device body, each defining at least one branch passage in communication with the main flow passage. Each branch passage enters the main flow passage at an angle with respect to the longitudinal axis that imparts a flow through the branch passage that has a directional component that is parallel to the longitudinal axis and in the direction from the inlet to the outlet.