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MARSTON Non Opening Supports Bursting Discs These supports are not usually attached to the disc but fit immediately upstream of the bursting disc, sometimes in a recess provided within the holder. These supports follow the form of the disc, whether it be flat or domed, and have holes through which the product flows when the disc bursts. These supports are considered to be re-useable and therefore only one is required for each position. Generally, reverse buckling discs do not require any additional support to withstand vacuum or reverse pressure.