A method of coupling a catheter tunneler adapter to a catheter is provided. The method includes providing a catheter having a lumen divider at a proximal end thereof； forming a receiving notch in the lumen divider by removing a center portion thereof such that two divider side portions remain； providing a catheter tunneler adapter having a distal end including a radially inward step which defines a contact surface configured to be received in the proximal end of the catheter； positioning the distal end of the catheter tunneler adapter within the catheter until the radially inward step engages the receiving notch； and securing the catheter tunneler adapter to the catheter.
