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This rubber pad ensures a good seal under the bell jar to keep the vacuum operation of your casting and/or investment machine running at maximum efficiency. Made from high-quality natural gum-rubber for durability and long life; comes ready-to-use with die-cut center slits.
To keep the pad flat on the investing table, cut a 1" (25mm), X-shaped slit through the center of the vacuum pad to prevent any air pressure build-up under the pad during vacuuming.