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The Goodman B1810400 Rubber Coupling is a genuine OEM flexible connector designed for the GUN040-2 gas furnace. This molded rubber coupling provides an airtight, vibration-dampening connection between furnace components — commonly used on inducer, drain, or pressure-tube assemblies — and helps prevent leaks, rattles, and the pressure-switch faults that follow when an old coupling cracks or hardens.
The genuine Goodman coupling is molded to the exact inside diameter and durometer your furnace requires, so it seats tightly and stays sealed through years of heat cycling. Generic rubber couplings may be the wrong size or a softer compound that degrades quickly under furnace heat, leading to slow leaks and repeat service calls. OEM ensures a proper, lasting fit.
Easy. One of the simplest furnace repairs. Power down the unit, slide off the cracked coupling, and press the new one fully onto both fittings until seated. No tools required in most cases, and typically done in under 10 minutes. Inspect adjacent tubing while you're in there — a hardened coupling often accompanies other aged rubber components.