Coverstar A4203 Molded Housing Assembly with Rail 123 and 20' of Track Space White. Coverstar covers deliver the ultimate in safety, elegance, and convenience; they’re not just functional, they look great on top of your pool. Besides the many safety benefits, covers can also protect your pool to help you reduce maintenance needs, and help you save money on your heating and energy bills. With a pool cover, you can save money each month and spend less time cleaning and maintaining your pool, and more time enjoying your pool with your family.