"Keep your summer fun afloat with the TRL Watersports 2-Rider Big Mable Style Replacement Innertube Backrest, a direct replacement for popular 2-person towables like the Sportsstuff Big Mable, Airhead Pit Stop, and Gladiator Big Brawler. TRL Watersports innertubes deliver the highest level of durability and reliability built to handle serious action on the water. Already have a cover in great shape? Just slip these bladders inside and get back to the good times. Don't let a deflated ride get you down. Carry the 2-Rider Big Mable Style Replacement Innertube Backrest as a backup and be ready for more fun in a flash. Check the valve position shown in the product photo to confirm fit with your current backrest setupsome covers may require a flexible hose for inflation. Innertube only; covers not included. 69""L x 30""H. Direct replacement for popular 2-person towables Includes backrest bladder Superior durability and reliability Fits Sportsstuff Big Mable, Airhead Pit Stop, and Gladiator Big Brawler"