"Give your towable a second chance with the TRL Watersports 80"" Replacement Innertube. Built tough for non-stop lake or ocean action, the core bladder fits covers measuring 77"" to 81"" in diameterthis includes models like the O'Brien Ultra Screamer, XPS Tsunami 3, and White Knuckle Skimmer. Already have a cover in solid shape? Just swap in this high-quality innertube and get back on the water without missing a beat. No need to toss a great cover when all you need is a new inner core. Keep an extra TRL Watersports 80"" Replacement Innertube on hand to avoid vacation letdownsbecause nothing ruins a sunny day like a deflated ride. Innertube only; cover not included. Built tough for non-stop lake or ocean action Fits covers measuring 77"" to 81"" in diameter Superior durability and reliability Compatible with O'Brien Ultra Screamer, XPS Tsunami 3, and White Knuckle Skimmer"