I had the same problem. I opened the handel and found the broken old O ring. I used a regular O ring from Home depot. The size is a little off, it lasts one or two times then it leaks again. Any one knows where to get the correct O rings? It is the next thing that I will try. Thanks in advance for the tip.

Hi,
Have you tried the dedicated site for these products?
Husky Home Depot Power washers, Home Depot Husky Powerwasher Accessories, Parts for Husky Powerwasher (http://huskypowerwasher.com/)
Peace,
Clarke