1. Function :for liquid converance,low&medium pressure soiler, for heat exchange . 2. size:1/4-48 3. length:5.8m. 6m. 12m. and so on ! or for customers request ! 4. material :10#.20#. 5. steel grade :ST33, ST37.ST35.ST43.ST45 6. Standard:ASTM.A53/A106,GR.B/GR.A. DIN1626. DIN17175. DIN1629/4 7. Outside: painted black or red . as customers request !