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In the tree view, click Piping > Piping Specification > Piping Materials Classes.
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In the Piping Materials Classes branch, open a specification and click Piping Materials Class Rules > Gasket Selection Filter.
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Click the Insert Row Command to insert a blank row in the grid view.
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Define the gasket selection filter by providing appropriate values in the different columns.
The Gasket Selection Filter sheet in the Piping Materials Class.xls workbook corresponds to the Gasket Selection Filter node in the Catalog task. See Piping Reference Data.