The NRS Super Pump, an affordable high-pressure pump that's perfect for today's drop-stitch inflatable stand up paddle and body boards. Inflates to 20 psi with ease. You get double-action pumping (inflate on both up and down motions) when you have the red plug screwed into the air port in the top cap. This allows you to quickly put the majority of the air volume in your inflatable. When you need higher pressure, simply open the air port by removing the red plug and you can bear down with single-action strokes! Also included is a valve adapter that will lock into Halkey-Roberts New Short Valves and Summit 2 Valves. To install it, loosen the hose clamp and remove the C7 Adapter. Insert this alternate adapter and tighten the hose clamp. Use the Super Pump to fill and/or top off your inflatable, then reverse the hose for deflating at the end of the day. Note: The gauge gives you a reading while you're actively pumping. Once you stop pumping the valve's sealing surface closes and the gauge is no longer in contact with the chamber's pressure.