What are the specs for this Piston Kit?

The correct replacement for Goodman model ANZ130481AB — B1789878 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 ANZ130481AB — B1789878.

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.

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Goodman

OEM Goodman Refrigerant Piston Metering Kit for ANZ130481AB — B1789878

Name: OEM Goodman Refrigerant Piston Metering Kit for ANZ130481AB — B1789878
Brand: Goodman
SKU: GOODMAN-15194
Price: 7.95 USD
Availability: InStock

SKU: GOODMAN-15194 Brand: Goodman

$7.95 $10.95

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Goodman B1789878 Piston Kit

The Goodman B1789878 is a genuine OEM refrigerant piston (flowrator) metering kit for the ANZ130481AB heat pump. The piston is the fixed-orifice metering device that regulates refrigerant flow into the coil, setting the pressure drop that governs system capacity and efficiency. Using the correct piston bore is essential for proper superheat/subcooling and rated performance — the wrong size directly hurts capacity and efficiency.

Specifications

Category: Metering device / fixed-orifice piston
Function: Refrigerant flow control at the coil
Type: Bullet-style flowrator piston kit
Fits: Goodman ANZ130481AB heat pump
Part number: B1789878

OEM vs. Generic

Piston performance is entirely defined by its precise bore diameter, matched by Goodman to this unit's tonnage and refrigerant. Generic pistons may be close but not exact, throwing off charge and pressures. Since the OEM part costs only a few dollars, there is no reason to gamble on an off-spec substitute.

Install Difficulty

Intermediate to Advanced (4/5). The piston sits inside the liquid-line flare/orifice housing, so replacement requires recovering refrigerant, opening the metering assembly, seating the new piston, then evacuating and recharging. A certified-technician repair.

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 Refrigerant Piston M...

$7.95

Frequently Asked Questions

Does this Piston Kit fit my Goodman ANZ130481AB — B1789878?

Yes. This is the factory-specified OEM piston kit for the Goodman ANZ130481AB — B1789878. 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 ANZ130481AB — B1789878?

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.

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