This Jobe triple-action SUP pump is designed to inflate SUPs to pressures up to 20 PSI fast and easy! It features two 3,5 liter double-action cylinders, a pressure gauge to keep control and a Halkey Roberts nozzle to fit most Inflatable boards on the market. The Jobe triple-action SUP pump has three different operating modes to keep inflation easy at any stage: Double action on 2 cylinders quickly inflates your SUP up to 5 psi. Single action on 2 cylinders lets you inflate your SUP to 10 psi at moderate speed. Single action on 1 cylinder to inflate your sup to a maximum of 21 psi with minimal effort.