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3" x 4" x 1/2" x 1/4" Elliptical Spiral Max Handhole Gasket BaseSKU-MTP1C CSA Design Certified for InstallationSpiral Max gaskets can be made from a wide variety of profiled alloy containment strips combined with specified sealing composites. Following ASME B16. 20 code, the strips are wound around a mandrel specific to the finished gaskets internal dimensions. The gasket, inside diameter contains, at a minimum, three plies of preformed metal strip without the sealing composite and is spot welded at least three times at a distance no greater than 3, apart