The see-thru tub encourages children to explore and is great for teaching lessons such as sinking versus floating. The See-Thru Sensory Table from Jonti-Craft also provides ultimate splash control with a clear, tough, nine-inch deep acrylic tub. A matching see-through acrylic activity cover is included. This sensory table also features locking casters and a frame that easily fits through doorways making it easy to move from one area to another. Underneath, is a drain valve that can be connected to a standard garden hose, making clean up a snap. It is also available in a toddler height (20” high).