What are the specs for this Furnace Fitting?

The correct replacement for Goodman model AMES920803BNAA — A1781105 is this exact part. It is the factory-specified replacement with exact OEM specifications. Using a part with different specifications can cause equipment damage or void your warranty. You can verify this by checking the data plate on your Goodman equipment which lists the model number AMES920803BNAA — A1781105.

What symptoms indicate I need a new furnace fitting?

Common symptoms that indicate you need a new furnace fitting include unusual noises, intermittent operation, complete failure to operate, or visible damage. For specific diagnostic guidance, visit nationalhvacparts.com/pages/hvac-diagnostic.

Is this furnace fitting compatible with Bryant or Payne systems too?

Many Goodman parts are cross-compatible with Bryant and Payne systems since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across multiple brand labels with different model numbers. To verify cross-compatibility, check your Bryant or Payne equipment service manual for cross-compatible part numbers, or contact info@nationalhvacparts.com with your model number for confirmation.

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Goodman

OEM Goodman Vinyl Cap Plug for AMES920803BNAA — A1781105

Name: OEM Goodman Vinyl Cap Plug for AMES920803BNAA — A1781105
Brand: Goodman
SKU: GOODMAN-4725
Price: 5.95 USD
Availability: InStock

SKU: GOODMAN-4725 Brand: Goodman

$5.95 $7.95

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The Goodman A1781105 is a genuine OEM 1-piece vinyl cap plug engineered for the AMES920803BNAA gas furnace and other compatible Goodman/Amana platforms. This small but essential fitting seals unused knockouts, drain ports, and access openings on the furnace cabinet, preventing air leakage and keeping debris out of the combustion and blower compartments.

Because it is an exact-fit factory component, the A1781105 seats flush without modification, maintaining the sealed pressure envelope your furnace relies on for correct draft and safe operation.

Specifications

Manufacturer: Goodman (Amana family)
OEM Part Number: A1781105
Type: 1-piece vinyl cap / port plug
Material: Molded vinyl
Fits Model: AMES920803BNAA furnace
Equipment: Gas furnace

OEM vs. Generic

Choosing the genuine OEM A1781105 guarantees the correct diameter and snap-fit so the plug stays seated and airtight. Universal rubber grommets may seem interchangeable, but an incorrect size can loosen over time and compromise the cabinet seal. For a component this inexpensive, factory-original is the safe choice.

Install Difficulty

Easy (1/5). Push-in installation, no tools required. Always shut off power and gas before servicing the furnace.

Shipping Information

Orders placed before 3PM CST ship same business day
Standard delivery: 2-5 business days
Express shipping available at checkout
Free shipping on orders over $75
Tracking number emailed upon shipment

Return Policy

30-day returns on unused parts in original packaging
Electrical parts (capacitors, contactors, control boards) are final sale once installed
Email info@nationalhvacparts.com to initiate a return
Refunds processed within 5-7 business days

OEM Goodman Vinyl Cap Plug for A...

$5.95

Frequently Asked Questions

Does this Furnace Fitting fit my Goodman AMES920803BNAA — A1781105?

Yes. This is the factory-specified OEM furnace fitting for the Goodman AMES920803BNAA — A1781105. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.

How do I replace the furnace fitting on my Goodman AMES920803BNAA — A1781105?

Refer to your equipment service manual for model-specific steps. General approach: turn off power, photograph connections, remove old part, install new part, restore power and test. For gas components, hire a licensed technician. Email info@nationalhvacparts.com for guidance.

What symptoms mean I need a new furnace fitting?

Common symptoms: unusual noises, intermittent operation, complete failure, or visible damage. Visit our diagnostic hub for symptom-based troubleshooting.

Is this furnace fitting compatible with Bryant or Payne too?

Many Goodman parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.

Should I use OEM or aftermarket for my Goodman furnace fitting?

OEM recommended for reliability and warranty compatibility. OEM parts match exact factory specifications for proper fit, performance, and safety. While aftermarket alternatives cost less upfront, the risk of improper fit and reduced lifespan usually makes OEM the better value long-term.

How fast does National HVAC Parts ship?

Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.

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