What are the specs for this Cap?

The correct replacement for Goodman model AMSS921005CNAB Furnace — 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 AMSS921005CNAB Furnace — A1781105.

What symptoms indicate I need a new cap?

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

Is this cap 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 AMSS921005CNAB Furnace — A1781105

Name: OEM Goodman 1-Piece Vinyl Caps for AMSS921005CNAB Furnace — A1781105
Brand: Goodman
SKU: GOODMAN-7502
Price: 1.95 USD
Availability: InStock

SKU: GOODMAN-7502 Brand: Goodman

$1.95 $2.55

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Goodman A1781105 1-Piece Vinyl Cap

The Goodman A1781105 is a genuine OEM 1-piece vinyl cap used on the AMSS921005CNAB gas furnace to seal unused ports, protect exposed fittings, and cover manifold or tubing stubs. Though small, these caps prevent air infiltration, keep debris and insects out of open lines, and preserve the sealed-combustion integrity the furnace depends on for correct pressure-switch operation.

Specifications

OEM Part Number: A1781105
Type: 1-piece protective vinyl cap
Compatible Model: AMSS921005CNAB (and select Goodman/Amana furnaces)
Material: Flexible weather-resistant vinyl
Application: Port, fitting, and tubing-stub sealing
Brand: Goodman

OEM vs. Generic

The OEM vinyl cap is molded to the exact port diameter used on this furnace for a snug, air-tight friction fit. Generic caps in the wrong size can fall off or leak, defeating their purpose. For guaranteed fit, use the factory OEM cap.

Install Difficulty

Very Easy (1/5) — A push-on part requiring no tools. Simply press the cap firmly over the port or fitting until fully seated.

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 Cap fit my Goodman AMSS921005CNAB Furnace — A1781105?

Yes. This is the factory-specified OEM cap for the Goodman AMSS921005CNAB Furnace — 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 cap on my Goodman AMSS921005CNAB Furnace — 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 cap?

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

Is this cap 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 cap?

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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