The hoses were used once on 15th September 2020 and then installed on the hose holder that lasted my Victor for 100 years. I went today to use the hoses and there were a lot of bubbles popping up when opening the oxygen tank. In short, the product has been used 3-4 times for a little over a month and now I have to buy new hoses again. Haven't contacted the company but thought it wouldn't hurt to see it's been over a month. It turned out that with a well-known brand there can be no mistake. I used to get more special hoses for cargo ports. Wouldn't recommend buying them.