Below is a list of Corrugated Stainless Steel Tubing manufacturers from Philadelphia, Pennsylvania. Corrugated stainless steel tubes are multilayered hollow cylindrical objects used as an alternative to traditional steel piping as the medium through which gases are transported. Commonly abbreviated CSST, this particular type of tubing is used predominately in gas distribution industries and those industrial, commercial and residential applications in which gas transport, gas heating and appliances are commonly employed.