Viton® o-ring, 20.3 mm inner diameter by 1.8 mm width, used with quartz torches in Optima™ 2x00 DV, 4x00 DV, 5x00 DV, 7x00 DV, and 8x00 ICP-OES series instruments.
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One of these o-rings is included in the Quartz Torch O-Ring Kit (N0770437).