Sauermann Si-CA Water Trap Filter (Pack of 5) – 27729 The Sauermann Si-CA Water Trap Filter Pack of 5 keeps a flue gas analyser running safely and efficiently, providing genuine replacement filters for the Sauermann 27555 and 27556 water traps used with the Si-CA 030, 130 and 230 analysers. Changing water trap filters regularly helps maintain both the accuracy and long-term reliability of the analyser, since a blocked or saturated filter allows moisture to reach the pump and internal components. Each pack contains 5 filters, making it a practical stock item for HVAC engineers and technicians using Sauermann combustion analysers in the field. Key Features & Benefits Genuine Sauermann Filters: Fit the Si-CA 27555 and 27556 water traps perfectly. Protects