We actually tested the air tube with a 5 gallon bucket and found a small pin leak got the pin leak with a rubber cement, but I wanted to replace with a new one so Appliance Pro had the best price and could get the part to me in a few days so I ordered the part replace with the new one and the machine is working fine. I called the parts in my area but they would have to order and it would not get here any quicker & the cost and shipping was more so ordering from Appliance Pro was a no brainer. Thank you.