WARDFLEX is a corrugated stainless steel tubing (CSST) system designed to distribute fuel gas in residential housing units and commercial structures. WARDFLEX has been engineered, tested and certified to meet the performance requirements of American National Standard for Fuel Gas Systems Using Corrugated Stainless Steel Tubing, ANSI LC- 1. As such is acceptable for use with all recognized fuel gases, including natural gas and propane.