Where can i get a part for my pressure washer model FH130A. it is the part that connects the hose to the unit. The plastic threads are worn and when I turn on the unit it keeps popping off. I looked it up on a parts chart and I think it is a combination of parts 25/26/27. It has the word stop on it and it is green in color. If you pull back on the green part it releases the back end. Not sure how I could connec a hose without it since this acts as a coupling. Thanks for the help