An optical fiber connecting unit includes a first and a second support members 33 and 34 hinged to a fixed member 37 to be swingable about a common axis 38. Wrapping the ratchet around a seat post of bicycle by inserting it through the bifurcation and a space between the pawls and one end of the ratchet, pivoting the fastening member toward the seat until one pawl engages the ratchet and the fastening member presses on the base to urge against the seat post, and pivoting the bifurcation to press the bar onto the projection will fasten the seat post. A central lumen connects at least one opening at the first end region to at least one opening in the bladder end region. In some embodiments, the assembly further includes a vaporization region within the catalyst chamber.