The Fish-Flo2 DC TOURNAMENT SERIES is an inexpensive oxygen system designed specifically for the marine industry that delivers nearly five times the oxygen level to your bait well than a standard aeration system provides. Fishflo2 nickel plated brass body and internal parts ensure a long life under severe marine conditions. Just screw on a disposable oxygen cylinder found at most hardware or home improvement centers and you’re good to go for 24 hours.