Seamless & Welded Tubing We stock Seamless & Welded Tubing in grades 304, 304L, 316, & 316LSize Range: 1/8″ – 7″Specifications: A-249/SA-249, A-269/SA-269, A-213/SA-213, A554 & A-270/SA-270In addition, Energy Pipe & Supply stocks a full line of instrument tube fittings and valves. Tube Fittings