This Jobe Triple Action SUP Pump is designed to inflate SUPs to pressures up to 21 PSI quickly and easily! It features two 3.5-liter double-acting cylinders, a pressure gauge to maintain control, and a Halkey Roberts mouthpiece to fit all Jobe inflatable boards on the market. The Jobe Triple Action SUP Pump has three different modes of operation to keep inflation easy at any stage: the 2-cylinder double action quickly inflates your SUP up to 5 psi. The single action on 2 cylinders allows you to 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.