Choose reliability with Kaeser parts Kaeser's service personnel use only genuine maintenance and spare parts with proven durability to ensure unrivaled reliability and long service life. Only Kaeser original parts guarantee tested quality. Service kits Kaeser service kits contain the spare parts that our experience tells us are most frequently required. This means they are ready for immediate use and ensure the compressor availability. Sigma Fluid Kaeser's advanced SIGMA FLUID coolant not only ensures exceptional wear-protection and lubrication (even at low temperatures), but also simplifies condensate treatment.