... :Butt Weld & Socket Weld & Thread 3)Standard:ASME,ANSI,BS,DIN,JIS,etc. 4)ISO 9001:2008 SO(Slip On ... ConnectionButt Weld & Socket Weld & ThreadPressure American Series: CLASS 150, CLASS 300, CLASS 400, CLASS 600, CLASS 900, CLASS 1500, CLASS 2500European Series: PN 2.5, PN 6, PN ... Groove (T&G),Male-and-Female (M&F)StandardASME,ANSI,BS,DIN,JIS,etc.Surface Treatment Transparent oil, rust-proof black ...