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Various transitions in vacuum systems require voltage isolation. Breaks and Envelopes are all suitable for ultra high vacuum environments. Both are constructed using a high purity alumina insulator sealed into stainless or Kovar sleeve adapters. Vacuum Breaks are available with nominal tube diameters up to 3 inches, and voltage ratings up to 60,000 Volts DC. Standard designs include Weldable, Conflat Flange and Quick Flange adapters.