I bought mine at a a chain store. It is on a dolly, which seems handy, but it is easy to roll off. This unit has far too many, vital exposed parts that tend to fracture or break. I'm still trying to find the copper line that connects the pump to the tank.
Pros:Light Weight, Easy To Store
Cons:Low Quality, Durability
Warren Does Not Recommend This Product
You may want to give the folks at Pro-Force a call, toll free, at (888) 895-4549 for the part you're looking for.