What are the specs for this Piston?

The correct replacement for Goodman model GSC130484BB — B1789888 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 GSC130484BB — B1789888.

What symptoms indicate I need a new piston?

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

Is this piston 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 Flow Check Piston Kit for GSC130484BB — B1789888

Name: OEM Goodman Flow Check Piston Kit for GSC130484BB — B1789888
Brand: Goodman
SKU: GOODMAN-798
Price: 10.95 USD
Availability: InStock

SKU: GOODMAN-798 Brand: Goodman

$10.95 $14.78

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Texas CMBL #19328542014

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The Goodman B1789888 is a genuine OEM flow check piston (fixed-orifice metering device) kit for the GSC130484BB 4-ton, 13 SEER air conditioner. The piston meters refrigerant flow into the evaporator coil, allowing flow in one direction and restricting it in the other. Correct orifice sizing is critical to system capacity and efficiency — an incorrect or worn piston causes poor cooling, high head pressure, or coil flooding.

Type: Flow check piston / fixed-orifice metering device
Fits: Goodman GSC130484BB and matched coil systems
Function: Meters refrigerant to the indoor coil
Includes: Piston and seal hardware
Part Number: B1789888

OEM vs. Generic: The genuine Goodman piston is bored to the precise orifice diameter engineered for this tonnage and refrigerant charge. Generic pistons may be close but not exact, and even a small orifice mismatch shifts superheat/subcooling out of spec. Always match OEM sizing for proper system charge and performance.

Install difficulty: Moderate to advanced. Replacement requires recovering refrigerant, opening the sealed refrigerant system, and re-evacuating/recharging — EPA 608 certification and proper tools are required. Professional installation is strongly recommended.

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 Flow Check Piston Ki...

$10.95

Frequently Asked Questions

Does this Piston fit my Goodman GSC130484BB — B1789888?

Yes. This is the factory-specified OEM piston for the Goodman GSC130484BB — B1789888. 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 piston on my Goodman GSC130484BB — B1789888?

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 piston?

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

Is this piston 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 piston?

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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OEM Goodman Flow Check Piston Kit for GSC130484BB — B1789888

Shipping Information

Return Policy

Frequently Asked Questions