The Polar Bear Tubes are 2 inch PVC pipes with standard end caps custom built to fit inside your cooler. Held together with traditional PVC glue. Only fill the tube to about 90%. It serves as dead space that will fill with ice as the water expands. recommends leaving it sit for at least an hour before filling with water.
10 Useful Fishing Tools You Can Make Yourself Out of PVC
10 PVC Fishing Projects You Can Do Yourself. polar bear tubes to keep cooler cold.