What are the specs for this Fitting?

The correct replacement for Goodman model AMSS920403ANAA — 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 AMSS920403ANAA — A1781105.

What symptoms indicate I need a new fitting?

Common symptoms that indicate you need a new 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 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 Fitting for AMSS920403ANAA — A1781105

Name: OEM Goodman Vinyl Cap Plug Fitting for AMSS920403ANAA — A1781105
Brand: Goodman
SKU: GOODMAN-7435
Price: 3.95 USD
Availability: InStock

SKU: GOODMAN-7435 Brand: Goodman

$3.95 $5.25

OEM Guaranteed

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Texas CMBL #19328542014

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The Goodman A1781105 Vinyl Cap is a genuine OEM 1-piece plug fitting used to seal unused ports, knockouts, and access holes on AMSS920403ANAA gas furnaces and compatible Goodman/Amana equipment. Though small, this cap is a factory-specified component that keeps conditioned air, dust, and pests out of the cabinet while maintaining the furnace's intended airflow and combustion sealing.

Specifications

Type: 1-piece snap-in vinyl cap
Material: Flexible weather-resistant vinyl
Application: Port / knockout / access-hole plug
Fits: Goodman AMSS920403ANAA and select Goodman/Amana furnaces
OEM Part Number: A1781105

OEM vs. Generic

The genuine OEM A1781105 is molded to the exact diameter and depth of Goodman's factory openings, so it seats flush and stays put through thermal cycling. Generic universal caps often sit loose or too tight, allowing air bypass or falling out over time. For a leak-free, factory-correct seal, OEM is the safer choice.

Installation Difficulty

Easy (1/5) — no tools required. Simply press the cap firmly into the port until fully seated. Installation takes under a minute. Always shut off power and gas before servicing your 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 Fitti...

$3.95

Frequently Asked Questions

Does this Fitting fit my Goodman AMSS920403ANAA — A1781105?

Yes. This is the factory-specified OEM fitting for the Goodman AMSS920403ANAA — 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 fitting on my Goodman AMSS920403ANAA — 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 fitting?

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

Is this 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 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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