The Glow-worm O-ring is designed for use in the heat exchanger of Buckingham 4, Compact, Economy, Economy Plus, Fuelsaver, Fuelsaver Complheat, Fuelsaver UFB, Hideaway, Ikon, Micron, Protherm, Spacesaver, Ultimate, Ultracom, Xeon, Spacesaver Complheat, Swiftflow, Eden, SXI, Spacesaver KFB, Cast Iron, SD and CXI boilers.
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