... 100% Leakage test SHENGZI Corrugated Stainless Steel Tubing gas piping system(CSST) can be used for domestic and industrial and ... without outer jacket); OD:18.5mm(with outer jacket). 2)Standard length: 20 meters, 30meters, 50meters/roll, or customized.3) ... (colour choice: yellow , light stone...)The SHENGZI Gas Piping System provides the installer with both flexibility, the prospect of significantly ...