Corrugated stainless-steel tubing is now approved for nationwide use.
For proponents of corrugated stainless-steel tubing, 2002 was a banner year. After years of fighting for inclusion in building codes across the nation, most notably the battle in California, nationwide approval for CSST has been won.
The International Association of Plumbing and Mechanical Officials has long been an opponent of CSST as an alternate material for gas piping. However, it recently reversed its position and approved CSST for inclusion in its 2003 Uniform Plumbing Code.