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The Lennox 18K17 (105827-08) is an OEM 10-orifice gas manifold engineered to deliver consistent and precise fuel flow to ten burner ports in compatible Lennox furnace units. Signs of manifold failure include uneven or weak burner flames, difficulty achieving set temperatures, or unsafe fluctuations in gas pressure that can compromise system efficiency and safety. This authentic Lennox OEM replacement guarantees a perfect fit and restores full multi-burner heating performance.