The Water -Provoking Column On The Steam Boiler Dkvr 20/13. Gost 9653-74, Washers Sealing External Diameter 18 Mm, Inner Diameter 8 Mm, Thickness 2 Mm. Gost 11371, Washers Sealing External Diameter 16 Mm, Inner Diameter 6 Mm, Thickness 2 Mm Gost 11371
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