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Heat exchanger O- ring for Eberspacher heater D5W early, non-hydronic versions 81mm x 3mm Suitable for the following Eberspacher water heaters 201645050000 B5W 201677050000 B5W201690050000 B5W251599050000 D5W251600050000 D5W251670050000 D5W251671050000 D5W251732050000 D5W