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The ASA/ANSI elastomer sealed flange system uses bolt kits to fasten two flanges and Viton® elastomer o-rings to create a seal. In addition to the standard fasteners and seals, adaptive bushings are available to reduce ASA/ANSI bolt holes from 3/4" to 3/8". Adaptive bushings are commonly used to connect an ASA/ANSI flange (sizes 200, 300, or 400) to a gate valve with a matching flange.

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