Tubes and Fittings ACE VALVE CO. ASTM A53/A53M Grade B(ABS Grade 3), ASTM A106 Grade B(ABS Grade 5), GB/T 5312 Grade 410 & 490, API 5L PSL1 Grade B & X52, PSL2 BN & X52N with O.D. 610mm X 30.18mm, JIS G 3454 Grade STPG370 & STPG410 with O.D. 609.6mmX W.T. 31.0mm.
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