You ride on: a tube
Racing tube slides
Two slides that look exactly the same, side by side. You and a friend start at the same time and race to the bottom.Two mirror-image flumes for side-by-side racing. Polin King Cobra, WhiteWater Parallel Pursuit and Dueling AquaLoop (2010), ProSlide Dueling Pipeline and Launched Dueling RocketBLAST.
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Companies make racing versions of many slides. There are even racing AquaLoops and racing water coasters!