... 3ISO,TS,EN,AS Floating Roof Storage Tank with a Nylon Composite Central Flexible steel drain pipe Product SynopsisNylon composite ... outerpressure resistance and anti-caving. The outer layer is a nylon extruding outer coating, completelysealed and leak free, which can ... to perform, thus made it sealed, safety and reliable.Nylon composite central flexible drain pipe used in Floating roof storage ...