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GOST 12821-80 Welding Neck
GOST 12821-80 Welding Neck
Category GOST Flan
Description
GOST PN06, PN10, PN16, PN25, PN40, PN63, PN100, PN160
PN06, PN10, PN16, PN25, PN40, PN63, PN100, PN160
CS CT20, 16MN SS 304/304L，316/316L
