3-layer side panels made of durable PVC and polyester. 3-ply tape provides additional support on the wall. The built-in drain valve for flow control is connected to the garden hose (with the supplied adapter) for easy draining of water. Printed mosaic inner lining on the sides and bottom of the pool. The round design ensures easy installation, improved stability and less waste of space as the pool does not require lateral support. Pool equipped with patented Seal and Lock System - custom-made frame joints with locking pins ensure a secure fit while providing advanced corrosion protection. Underwater repair patches. Contents: One pool, filter pump, safety ladder, pool cover, compatible with cartridge type II. Rugged pool sidewalls are constructed of Tritech , a three layer reinforced material with a polyester mesh core and two layers of high strength PVC for superior strength and durability.