This Jobe Triple Action iSUP Pump is designed to inflate iSUPs fast and easy. It features two 3.5 litre double action cylinders, a pressure gauge to keep control and a Halkey Roberts nozzle to fit all Jobe inflatable boards. It has three different operating modes to keep inflation easy at any stage: Double action on 2 cylinders quickly inflates your iSUP up to 5 psi. Single action on 2 cylinders lets you inflate your iSUP to 10 psi at moderate speed. Single action on 1 cylinder allows you to inflate your sup to a maximum of 21 psi with minimal effort.