What are the specs for this Fitting?

The correct replacement for Goodman model AMEC961004CNAB — 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 AMEC961004CNAB — 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 Caps for AMEC961004CNAB — A1781105

Name: OEM Goodman 1-Piece Vinyl Caps for AMEC961004CNAB — A1781105
Brand: Goodman
SKU: GOODMAN-4288
Price: 1.95 USD
Availability: InStock

SKU: GOODMAN-4288 Brand: Goodman

$1.95 $2.59

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Goodman A1781105 1-Piece Vinyl Caps

The Goodman A1781105 is a factory-original 1-piece vinyl cap used on the AMEC961004CNAB gas furnace to seal unused drain ports, tubing stubs, and fittings. These caps keep debris, dust, and moisture out of open ports and are commonly repositioned when configuring a furnace for upflow, downflow, or horizontal installation.

Specifications

Part number: A1781105 (OEM)
Type: 1-piece push-on vinyl cap / plug
Function: Seals unused ports and protects fittings
Fits: Goodman/Amana AMEC961004CNAB and related models
Equipment: Gas furnace

OEM vs. Generic

The OEM cap matches Goodman's exact port diameter for a snug, airtight fit. A Generic vinyl cap of matching size can substitute at a lower cost, but confirm the inner diameter to ensure a proper seal.

Installation Difficulty

Very Easy (1/5). Simply push the cap onto the port or fitting by hand. No tools required — a 1-minute task.

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 Caps f...

$1.95

Frequently Asked Questions

Does this Fitting fit my Goodman AMEC961004CNAB — A1781105?

Yes. This is the factory-specified OEM fitting for the Goodman AMEC961004CNAB — 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 AMEC961004CNAB — 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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