The Ingersoll Rand 54729876 gasket is used to create a seal between the separator tank and the cover plate. This gasket is primarily used on the Ingersoll Rand UP6 20-30 and UP6S 20-30 rotary screw air compressors. This gasket sits on teh end below the oil filter and separator element. This is on the same side where you can see the oil level. It's a round gasket with 8 holes where the screw from the cover plate attach to the separator tank.
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