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The gaskets are flexible and adapt more easily to curvatures and irregularities of the flanges. Specially recommended for water and steam systems, both in heating engineering, power engineering and municipal economy. The sheet is resistant to oils, brake fluid and cooling fluid.. JTM 1.5mm PN6 Non Asbestos Y Grade Flange Gaskets - 4 inch AF300-1.5-4-PN6IBC