Accessories Pumps Dahon Postpump For Dahon. Weve all been lured by the `two for one deal` and in this case you really get twice the value. The DAHON PostPump gives you an air pump within your seat post, freeing up space and weight while making sure you are never without a pump when you need it. Just remove the seat post with our quick release lever and you have a floor pump that is capable of reaching over 100 psi in half the strokes of some of the best mini pump. Features Seamlessly incorporated into seatpost Reaches 100 psi in less time than other mini-pumps Keeps a portable pump for flat tires always within reach PostPump head adapts to fit Prester and Scraeder valves