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The isocratic pump has the same operating principle as the quaternary pump but has only one solvent channel, that means the composition cannot be changed during a method because there is no multi-channel gradient valve (MCGV). The isocratic pump does not include a degasser. An upgrade product (Isocratic to Quaternary Pump Upgrade Kit (G4207A)) is available for upgrading the isocratic pump to a quaternary pump including a degasser.
