Corrugated stainless steel tubing (CSST) has been widely used for natural and propane gas systems. Not all mechanical contractors embraced CSST, but the potential labor savings certainly were attractive enough to convince most installers to incorporate CSST into the mix, especially in new construction where competitive bidding can be fierce. Stray voltages from lightening strikes have caused a few ungrounded gas systems that incorporate CSST to develop a pinhole where the current arced ...

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