A dilator for sheathless access to a vessel of a patient having a tubular distal member with a skived portion on the proximal end and a proximal member with a skived portion on the distal end. The respective skived portions overlap at a transition region and form a rapid exchange port that communicates with the lumen of the distal member. The proximal member and the distal member may be secured together with transition tubing that is coaxially disposed over the distal and of the proximal member and extends over the skived portion of the distal member within a projected circumference of the distal member.