... ,Reducers,Caps,Bends,Returns ASTM A420 WPL6,WPL9,WPL3,WPL8 Low temperature carbon steel pipe fittings Elbows,Tees,Reducers,Caps,Bends,Returns ... Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Low-Temperature Service GRADEASTM A420 WPL6ASTM A420 WPL9ASTM A420 WPL3ASTM ...