... international Q235 material, Good elasticity, not deformation, not flagging for life. Add the perfect double galvanized; not rusts, service ... heat-resistant, not deformation, no broken. Using life is for 15 years. High compressive capacity: adults can walk random on ... years. If it damage or leakage in Three years, replacement for free. (Except artificial damage) 6.Enclosed type compressor governor: ...