A dilator 10 for sheathless access to a vessel of a patient having a tubular distal member 14 with a skived portion 24 on the proximal end and a proximal member 16 with a skived portion 26 on the distal end. The respective skived portions overlap at a transition region 18 and form a rapid exchange port that communicates with the lumen 22 of the distal member. The proximal member and the distal member may be secured together with transition tubing 28 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.