When nature strikes-earthquakes lightning-it can lead to deadly results. That is why corrugated stainless steel tubing (CSST) was developed to eliminate the danger of rigid gas piping. Twenty years ago the American National Standards Institute published the first CSST product standard- ANSI LC-1. Since then over 750 million feet of CSST has been installed in over five million homes in North America. Unlike rigid pipe Counterstrike disperses electrical energy and is listed by Factory Mutual for seismic resistance. Counterstrike is up to 400 times more resistant to the damaging effects of electrical energy than yellow CSST it meets ASTM E84 with respect to flame spread and smoke density, this permits installation in return air plenums.