If you go buy a float tube or pontoon boat, be certain you buy a pump that matches the valve on your particular vessel. The are two common types of valves. The pump you may already own, may need an adaptor to fit the valve type of your new tube/’toon.
I have owned a K-Pump for several years and love the product. I always used it for the Buck’s Bags South Fork pontoon boat (Halkey Roberts Valve) I have owned, it seems forever. Recently, I picked up a Cumberland float tube, for an addition to my tube fleet. I was in the outdoors and went to inflate the tube and low and behold, the K-Pump did not fit the tube (Boston Valve). I rigged something up, because I had a hodge podge of adaptors and duct tape, and was able to inflate the tube, but it was a chore. When I got home, I reached the K-Pump staff and they explained they did in deed have an adaptor for my K-Pump so that I could easily inflate Halkey Roberts or Boston Valves. Great company!!! Do a little checking before your purchase/and or assume your K-Pump (or any pump) automatically fits all valves.
Now a leaking valve is an entirely different subject all together.