On their official website, the National Association of State Fire Marshals asks the question, “Do you have this fuel gas piping installed in your home or business?”
As part of their Yellow CSST Safety Campaign, they go on to explain, “Corrugated stainless steel tubing (CSST) is a flexible, stainless steel piping system used to supply natural gas and propane in residential, commercial and industrial structures. Standard CSST is coated with a yellow exterior plastic coating. CSST should be properly bonded and grounded in order to reduce the risk to your house or business caused from lightning activity.”
For more information, visit csstsafety.com