This standard specifies the characteristics of gasket seal with nickel alloy C seal on heat resisting steel, 3 holes, for pipe couplings for inch series aerospace applications. Nominal pressure: up to 21000 kPa; depends on the associated tube material and tube wall thickness in the assembly (see EN 4814). Temperature range: -55 °C to 600 °C. NOTE Assembly in accordance with TR 4815. This part should not be reused after disassembling.