Each operation produces a displacement of 2000, and with one push and one pull, the total displacement reaches 4000!
Feature and Function
(1) Works while pushing and pulling; (2)Comparing with traditional pump you only need half of the time; (3) It supply airflow on both up and down strokes, make it easy for inflation work. (4)Ideal for inflatable mattresses, toys, rubber boats and tents; (5) Super efficient with time spent pumping; (6) High volume side inflates and deflates; (7) Contain 3-5(according the article) nozzles, adaptable to all king of valves.