Built-in flow control drain valve makes it easy to drain by attaching the valve to a garden hose (with included adapter) to drain away water . Underwater adhesive repair patch The extra strong side walls of this pool are constructed with Tritech, a 3 layer reinforced material with a polyester mesh core encased between two layers of high gauge PVC material. This creates a total thickness of 0.40-0.80mm (16-32 gauge) depending on the size of the pool, offering superior strength and durability * Corrosion resistant metal frames. Easy to take down for off-season storage. Rectangular shape provides more area for swimming and playing