If you have a backyard pool, frequent overnight guests, or spend a lot of time on the water, the Sportsman series 16-inch Double Action Hand Pump is an item you will find yourself reaching for again and again. The 16-inch double action pump creates air flow in both the up and down strikes, so it can produce approximately 68 -Gallons of air in just 60 strokes. That"s enough to fill a twin size air mattress in just over a minute. Since it is a manual air pump, it doesn"t need to be plugged in, making it great for campsites without electricity. The pump"s quiet operation won"t wakeup the entire house like electric pumps.