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14" x 18" x 1" Elliptical Black Max Manhole Gaskets - 2 Pack BaseSKU-50279 Replacement Head for V8043E ZoneCompared to spiral wound gaskets, BLACK MAX gasket seal better and has much better recovery properties. And while spiral gaskets require near perfect conditions, BLACK MAX gaskets seal on rough, pitted surfaces under less compressive load. Black Max gaskets are made from multiple layers of foil reinforced, exfoliated graphite and 316 stainless steel, ensuring gasket stability. The temperature range of the components and the recovery at broad