Line Pipe We also manufacture high quality API 5L ERW line pipe out of our Stephenville, TX location. CAPABILITIES ERW Line Pipe ERW Line Pipe Product Specification Level (PSL)PSL 1, PSL 2 Diameters2″, 2 ½”, 3″, 4″ GradesX-42, X-52, X-70 LengthsSRL, DRL