NRS 5" Barrel PumpCommercial 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