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factory direct sell sleeve type sonic pipe OD 50mm acoustic tube for detective channels of steel pipe, US $ 1 - 3.7 / Piece, JIS, DIN, JIS G3458-2005, DIN 17175, Q195-Q345, Q235, Q195, Q215, 0.7 - 3.5 mm.Source from Shandong Hongsheng Steel Pipe Co., Ltd. on Waimaotong.com.