If turgor pressure becomes equal to the wall pressure, then

The pressure that develops in a cell from time to time due to osmotic diffusion of water molecules into a cell that causes stretching of the cell wall is called turgor pressure. Due to turgor pressure, rigid cell wall offers resistance. This resistance works in a direction opposite to turgor pressure. But it is equal to turgor pressure and is called wall pressure. In this condition, no exchange of water takes place.