What are the specs for this Fitting?

The correct replacement for Goodman model GMPN040-3 — B1392139 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 GMPN040-3 — B1392139.

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 View Port Bushing Sight-Glass Grommet for GMPN040-3 — B1392139

Name: OEM Goodman View Port Bushing Sight-Glass Grommet for GMPN040-3 — B1392139
Brand: Goodman
SKU: GOODMAN-B1392139
Price: 0.85 USD
Availability: InStock

SKU: GOODMAN-B1392139 Brand: Goodman

$0.85 $1.15

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The Goodman B1392139 View Port Bushing is a genuine OEM sight-glass grommet for GMPN040-3 gas furnaces. This small bushing seals the burner-compartment observation port, letting technicians view the flame while keeping the combustion area properly sealed. Though inexpensive, a missing or cracked view-port bushing can allow air leakage that affects draft and flame stability.

Specifications

OEM Part Number: B1392139
Type: View port bushing / sight-glass grommet
Function: Seals burner observation window
Material: High-temperature grommet
Fits: Goodman GMPN040-3 gas furnace
Brand: Goodman / Amana (Daikin)

OEM vs. Generic

This is a molded-to-fit OEM part sized to the exact port opening on your furnace panel. Aftermarket grommets rarely match the diameter and can leak or fall out. At this price, genuine Goodman is the obvious pick.

Installation Difficulty

Very Easy (1/5). Press the bushing into the view-port opening by hand — no tools required. Disconnect power before opening the burner compartment.

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 View Port Bushing Si...

$0.85

Frequently Asked Questions

Does this Fitting fit my Goodman GMPN040-3 — B1392139?

Yes. This is the factory-specified OEM fitting for the Goodman GMPN040-3 — B1392139. 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 GMPN040-3 — B1392139?

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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