Best check Solar hose, in original length for leaks. Only in this way you can change this. For me, the solar tube was gorged into the space of the solar heating system with, think through the superficial packaging the hose was damaged at one point. Unfortunately, I have noticed during installation until later, ie the hose was broken into several pieces already. Unfortunately, the tubing can be Exchanged only throughout, so check beforehand. Dealer cometh not prevent. Therefore, only 2 stars.
