Ask A Roofers - What is it? #7

This is a picture of my daughter a few years ago holding a “what is it” out in front of my shop. It is a part of a system that is installed on all kinds of roofs, all over the world. Do you have any idea what it is?

Answer

Have a question? AskARoofer HERE

Need a contractor?  Check out our list of Roofing Contractors HERE.