... corrosion, durable. 3.CSA approved Features: 1) Connector for indoor & outdoor gas piping2) High flexibility, withstands corrosion, durable, reliable, safe, and ... install and won't leak gas if installed incorrectly5) For gas mediums such as city gas, petroleum liquefied gas, natural gas, oil, waterSpecifications:1) ... 100 - 4000mm or custom request11) Consult standard: GB/T14525-93 Gas Connectors