SOLAR INDUSTRIES 4 X 12 collectors with 1 12 header as replaced by Stillwell Solar in 2017 and 2018.We have three that cost $400 each, installed. Our roof has been replaced and the system has been removed. nine panels. We have installed a 100 new system with the new roof. If you have leaky panels these will fix your problem. $200 each or $500 for all three.