... ,WPL9,WPL3,WPL8 Low temperature carbon steel pipe fittings Elbows,Tees,Reducers,Caps,Bends,Returns ... WPL6,WPL9,WPL3,WPL8 Low temperature carbon steel pipe fittings Elbows,Tees,Reducers,Caps,Bends,Returns ASTM ... A420 / A420M Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy ... Steel for Low-Temperature Service GRADEASTM A420 WPL6ASTM ...