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