Product Description. Designed for one rider Heavy duty full nylon cover with zipper Heavy gauge PVC bladder Double webbing foam handles with padded knuckle guards Self-bailing drain vent Reinforced Tow system Quick connect Tow hook Padded valve cover SIZE: DIAMETER 48"(122CM) (DEFLATED) Recommended PSI (Pound per Square Inch) rating 0.8 - 3.0. *Note, The Larger Towable The Lower The PSI.