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<table> <tr> <td>The flange cover is also called blind flange and blind plate. It is a flange without a hole in the middle for sealing the pipe plug. The function is the same as that of the welded head and the threaded cap, except that the blind flange and the threaded cap can be removed at any time, but the welded joint is not.cheap Alloy Steel Flanges<br> website:http://www.cxflange.com/alloy-steel-flanges/</td> </tr> </table>