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DI 316 Stainless Steel Water Flap Check Valve With Flange DN 500 PN10 DN(size) D D1 hole(n-d) DN300 12" 440 400 12-23 DN400 16" 560 510 16-27 DN500 20" 670 620 20-27 DN600 24" 780 725 20-30 DN700 28" ...