1, material: CS, SS 2, connection: butt weld 3, size: 1/2"-48" 4, standard: ANSI, DIN, JIS, GB 1.SIZE :From 1/2 to 48 (Seamless pipe fittings). From 26 to 72 (Seam pipe fittings)2.STANDARD: AMSE,JIS ,DIN,GB3.MATERIAL: ASTM A234 WPB, A420 WPL3/L6 etc4. WALL THICKNESS : SCH10 to SCHXXS . equal Tee