The topeak joe blow twin turbo pump introducing topeakrsquos turboboost technology this technology utilizes the pull and push of every stroke by transferring air between its two barrels pulling the handle up moves a massive amount of air volume from the larger barrel into the smaller barrel pushing the handle down compresses the air in the smaller barrel into high pressure output that fills road tires with high pressure or mtb tires with large volume topeak joe blow twin turb