What are the specs for this Fitting?

The correct replacement for Goodman model GMPN100-4 — 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 GMPN100-4 — 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 Sight Glass View Port Bushing for GMPN100-4 — B1392139

Name: OEM Goodman Sight Glass View Port Bushing for GMPN100-4 — B1392139
Brand: Goodman
SKU: GOODMAN-12098
Price: 0.85 USD
Availability: InStock

SKU: GOODMAN-12098 Brand: Goodman

$0.85 $1.15

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Texas CMBL #19328542014

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The Goodman B1392139 View Port Bushing is a genuine OEM sight-glass fitting for the GMPN100-4 gas furnace and compatible Goodman/Amana models. This small bushing seats in the burner-compartment access opening, providing a clean, sealed window so you can safely observe the burner flame during operation without opening the cabinet. Though inexpensive, it maintains the compartment seal and keeps the viewing port intact.

Specifications

OEM Part Number: B1392139
Type: View port / sight-glass bushing (grommet)
Function: Seals and frames the flame-inspection viewing hole
Material: Heat-resistant molded bushing
Fits: Goodman GMPN100-4 furnace and cross-compatible models

OEM vs. Generic

The OEM Goodman bushing is molded to the exact port diameter for a snug, rattle-free press fit. Generic grommets rarely match the opening precisely and can fall out or fail to seal. At this price point, the genuine part is the obvious choice.

Installation Difficulty

Very Easy (1 of 5) — With the furnace off, press the old bushing out and snap the new one into the port opening by hand. No tools required. This is a common add-on when servicing the burner assembly.

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 Sight Glass View Por...

$0.85

Frequently Asked Questions

Does this Fitting fit my Goodman GMPN100-4 — B1392139?

Yes. This is the factory-specified OEM fitting for the Goodman GMPN100-4 — 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 GMPN100-4 — 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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