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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 > Washer 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 washer selection filter by providing appropriate values in the different columns.
The Washer Selection Filter sheet in the Piping Materials Class.xls workbook corresponds to the Washer Selection Filter node. See Piping Reference Data.