This size is the actual 4`x 4`x 8 ft tall and requires 6`x 20`set up to allow a good throwing area.It holds 500 gallons of water. Weight capacity is 250 lbs for the person on the hot seat and must be a minimum of 4`tall. A safety step is built into the tank to help with getting back on the seat after being dunked.Adult supervision is a must at all times.