Gas chromatography/mass spectrometry interface o-ring, 2-025, fluorocarbon, brown, for EI gas chromatography/mass spectrometry interfaces (transferline), used with series 5973, 5975, 5977 and 7000, systems 5973A, 5973N, 5973inert, 5975A, 5975B, 5975C, 5975C-TAD, 5975T, G7000C and 7002, and for gas chromatography/mass spectrometry CI upgrade kits, used with series 5973 and 5975, for system upgrades from 5973 EI to CI, 5973 EI to PCI, and 5975 EI to CI