Review on 🔧 Marathon 20990 4.10/3.50-4" Replacement Inner Tube: Ideal for Hand Trucks, Dollies, Pressure Washers, Compressors, Snow Blowers, and More by Robert Gilbert

The delivery arrived on time as promised. The size does not correspond to the specified one, instead of 4.10/3.50-4" I got 3.50-4", which is slightly smaller in diameter. The optics of the tubes weren't very good, the clear plastic bags they came in were stained inside wherever rubber had touched them, suggesting they had been sitting on a shelf somewhere for years. I tried the first one, installed it, pumped it up and everything looked fine. The next day the tire was flat, at first I blamed myself, maybe I jammed it during assembly. Examination of the tube showed that it burst in the packaging at the inner fold and either sat on the shelf for years or was stored in very unfavorable climatic conditions. I mounted the second tire with extra care, pumped it up and it looked good again until the next day when I found it was flat. Inspection revealed a separation where the valve was vulcanized to the tube. Luckily I still kept my original inner tube which I accidentally punctured with a sharp edge a few months ago, I patched it and two weeks later it's still holding pressure. The Marathon product is money thrown away!