I first tried fixing by replacing just the upper nozzle connector. That did not work, turned out the check valve ball and connector hose were bad, but you could not tell by looking at them. I decided to replace both the entire assembly that had both hoses, connectors and an entire be upper nozzle connector with check valve ball. If you have any problem with any part of the upper nozzle connector, I suggest you replace with this entire assembly to avoid multiple ordering of parts. It's also cheaper to just but the assembly than pay the individual cost of each part. This is an excellent product and works perfectly.