Cylinder for Life / Oxygen-Adding Cylinder

This oxygen-adding cylinder can be placed in lakes or ponds before the icing-up. The double-layered cylinder floats with attached weight at bottom.
The ice reaching 10cm thick allows people to walk upon. Under this circumstance, the inner cylinder filled with ice can be twisted out, thus letting in oxygen to the water. Meanwhile, the device also facilitates fish feeding and even fishing. The height and striking color of the cylinder could safely keep people from the danger of falling into the ice holes.