Corrugated Stainless Steel Tubing (CSST) is thin-walled metallic tubing that can be used as alternative gas piping material to steel pipe. CSST may have been used in your structure if it was built after 1990 or its gas piping system has been replaced or modified since then. CSST may have a yellow or black plastic exterior coating and would typically be present inside walls and through and along floor and ceiling joists. It is not the same as the flexible appliance connectors that connect to gas appliances.
To help protect structures from potential lightning strikes, the installer of CSST and/or the owner/operator of the structure where the CSST is used should consider installing an appropriate lightning protection system pursuant to NFPA 780 or other recognized standards.
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