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The A1781105 is a genuine OEM 1-piece vinyl cap used on Goodman VCES961005CNAA gas furnaces to seal unused ports, protect fittings, and cap off connection points during installation and service. Though small, these caps keep debris, insects, and moisture out of open tubing and maintain the correct pressure integrity of the furnace's venting and sensing lines.
OEM vinyl caps are sized to the precise port diameters found on Goodman furnaces, giving a snug, secure seal. Generic hardware-store caps may fit loosely and pop off under vibration or pressure. For a reliable seal, the factory-spec cap is the safe pick — and at this price there's no reason to compromise.
Very Easy — under 5 minutes. Simply push the cap over the intended port or fitting until fully seated. No tools required. A must-have consumable to keep on hand during furnace maintenance.