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Seal gasket standard:
1. Gb4622.2-93 spiral gasket pipe flange size series
2, gb9126.1-88 plane steel pipe flange with asbestos rubber sheet
3. Gb9126.2-88 asbestos rubber sheet for flange of pipe made of convex steel
4. Gb9126.3-88 asbestos rubber sheet for flange of steel pipe with concave and convex surface