What are the specs for this Piston Kit?

The correct replacement for Goodman model GSC130421BA — B1789884 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 GSC130421BA — B1789884.

What symptoms indicate I need a new piston kit?

Common symptoms that indicate you need a new piston kit 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 kit 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.

IMAGE COMING SOON

Goodman

OEM Goodman Piston Kit for GSC130421BA — B1789884

Name: OEM Goodman Piston Kit for GSC130421BA — B1789884
Brand: Goodman
SKU: GOODMAN-709
Price: 10.95 USD
Availability: InStock

SKU: GOODMAN-709 Brand: Goodman

$10.95 $14.78

OEM Guaranteed

Same-Day Ship

30-Day Returns

Secure Checkout

Texas CMBL #19328542014

SAM.gov Registered

Govt POs Accepted

The Goodman B1789884 is a genuine OEM piston (fixed-orifice metering device) kit for the GSC130421BA 13 SEER, 3.5-ton air conditioning system. The piston meters refrigerant flow into the evaporator coil, and its precisely sized orifice is matched to the unit's tonnage and coil to maintain correct superheat and system performance. Using the wrong orifice size starves or floods the coil and kills efficiency.

Specifications

Part Number: B1789884
Type: Fixed-orifice piston / metering device kit
Fits Model: GSC130421BA (3.5-ton / 13 SEER)
Function: Refrigerant flow control to evaporator
Brand: Goodman (OEM)

OEM vs. Generic

The genuine Goodman OEM piston is drilled to the exact orifice diameter engineered for this system's capacity. Generic pistons may be close but not identical in bore size, throwing off the refrigerant charge and superheat. The OEM kit ensures factory-rated cooling capacity and efficiency.

Installation Difficulty

Advanced. Replacing the piston requires recovering the refrigerant, opening the sealed refrigerant circuit, swapping the orifice, evacuating the lines, and recharging — all EPA Section 608 certified work. This must be performed by a licensed HVAC technician.

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 Piston Kit for GSC13...

$10.95

Frequently Asked Questions

Does this Piston Kit fit my Goodman GSC130421BA — B1789884?

Yes. This is the factory-specified OEM piston kit for the Goodman GSC130421BA — B1789884. 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 kit on my Goodman GSC130421BA — B1789884?

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 kit?

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

Is this piston kit 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 kit?

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.

Menu