| Swimline Covers | 12 W in | Wayfair 3 x ACC110DU The Swimline 10 Foot Double Water Tube is made specifically for use with your rectangular or oval pool cover to eliminate stress on your pool and the cover. It's 33% heavier then other water bags, making it super durable, and its valves are easy to... ... more Swimline Covers | 12 W in | Wayfair 3 x ACC110DU The Swimline 10 Foot Double Water Tube is made specifically for use with your rectangular or oval pool cover to eliminate stress on your pool and the cover. It's 33% heavier then other water bags, making it super durable, and its valves are easy to... Wayfair | | $69.99 $32.54 go to store |