Commercial outfitters swear that NRS Barrel pumps are built to last, get wet, and get used. The NRS Barrel pump combines a wide base for sure footing while inflating a raft. The 6.5' flexible hose tucks into the webbing carry handle for storing on your raft. This 5" diameter pump stands 2.5' high and has a stroke volume of 2.03 Gal (7.7 liters). This hand pump does not have a check valve. A check valve is necessary on military valves that don't have a one-way inflation feature. There is a spare O-ring gasket in the bottom of the pump cylinder. If you need to re-lubricate the pump, we recommend lithium grease. 5-year warranty.