The Glow-worm packing ring is designed for use in the heat exchanger of CXI, Easicom, Energy, Energy 7, Flexicom, Home, HXI, Ultimate, Ultracom, Ultracom2, Ultrapower, Ultimate 3, Energy 2, Essential, Sustain, Ultimate 2, Betacom, British Gas, Eden, SXI and Xtramax units.
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