What are the specs for this Fitting?

The correct replacement for Goodman model AMSS920402BNAA — 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 AMSS920402BNAA — 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 1-Piece Vinyl Cap for AMSS920402BNAA — A1781105

Name: OEM Goodman 1-Piece Vinyl Cap for AMSS920402BNAA — A1781105
Brand: Goodman
SKU: GOODMAN-7424
Price: 3.95 USD
Availability: InStock

SKU: GOODMAN-7424 Brand: Goodman

$3.95 $4.95

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Goodman A1781105 1-Piece Vinyl Caps

The A1781105 is a genuine OEM 1-piece vinyl cap for the Goodman/Amana AMSS920402BNAA gas furnace and compatible models. These protective caps seal unused ports, tubing stubs, and pressure taps, keeping dust, insects, and moisture out of the furnace's sensitive control and combustion pathways. They also serve as service caps during installation and seasonal maintenance.

Specifications

Type: 1-piece vinyl protective cap / port plug
Application: Sealing unused ports and tubing connections
OEM Part Number: A1781105
Brand: Goodman / Amana
Equipment: Gas furnace
Fits: AMSS920402BNAA and compatible Goodman/Amana furnaces

OEM vs. Generic

The OEM vinyl cap matches the exact port diameter for a snug, secure fit that stays in place. Generic caps may be loose or too tight, falling off or failing to seal. At this price, genuine OEM is the obvious pick.

Installation Difficulty

Very Easy (1/5) — Push the cap firmly onto the port or fitting until seated. No tools required. Typical time: under 5 minutes.

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 1-Piece Vinyl Cap fo...

$3.95

Frequently Asked Questions

Does this Fitting fit my Goodman AMSS920402BNAA — A1781105?

Yes. This is the factory-specified OEM fitting for the Goodman AMSS920402BNAA — 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 AMSS920402BNAA — 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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