3 ft. Deluxe Winterizing Cover Box for In-Ground Winter Pool Covers (6-Pack)

Robelle Cover Blox are the best alternative to water tubes. Unlike water tubes . Cover Blox will never split or break because of water expanding into ice. This product is over four times thicker than water tubes and doesn't have seams . so you will never have to replace a Cover Blox. They are easier to store than water tubes . because you can stack Cover Blox.