The Waters™ Performance Maintenance Kit for the ZQ, EMD1000 and Quattro Micro Mass Spectrometer contains all the Waters Quality Parts™ necessary to keep your instrument operating at peak performance on an annual basis. The Waters™ Performance Maintenance Kit includes the following parts: ESI Probe kit, sample cone, lapping film, inner API source kit, outer API Source Kit, oil mist filter element, powder-free gloves, source heater assembly, fused silica tube, 2L of ultragrade 19 oil and odour element. The old part number was 201000123. This particular part number does not deliver a chemical kit which is required to complete the performance testing.