Molchanovs recently added an Equalization Tool, with adjustable valve, so the flow resistance of the air to blow can be changed. 
This inflation device is a precision instrument that is designed to apply a specific or different pressure to the Eustation tubes. 
It comes with 3 baloons. Using the Equalization Tool, you just need to blow up through your nose to inlfate the baloon. The act of blowing up the balloon helps to open up the Eustachian tube, making it easier for fluid to drain from the middle ear.