I bought this to fill my garden tractor tires with antifreeze solution for traction. I have to mow on a fairly steep slope, and the lightweight mower often lifted the wheel or spun around the trees. I was able to get 4 gallons per tire, which is about 60 pounds more, without stressing the aluminum gearing like I would with rear-hung weights. I used an electric submersible pump that I placed in a five gallon bucket filled with antifreeze solution. About every minute you need to press the exhaust valve to deflate. Each hoop took no more than 10 minutes. I recommend this product. Four stars mean less than excellent instructions.