What are the specs for this Piston?

The correct replacement for Goodman model ANZ130181AA — B1789851 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 ANZ130181AA — B1789851.

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.

IMAGE COMING SOON

Goodman

OEM Goodman Refrigerant Piston Kit for ANZ130181AA — B1789851

Name: OEM Goodman Refrigerant Piston Kit for ANZ130181AA — B1789851
Brand: Goodman
SKU: GOODMAN-15130
Price: 5.95 USD
Availability: InStock

SKU: GOODMAN-15130 Brand: Goodman

$5.95 $7.95

OEM Guaranteed

Same-Day Ship

30-Day Returns

Secure Checkout

Texas CMBL #19328542014

SAM.gov Registered

Govt POs Accepted

The Goodman B1789851 Piston Kit is a genuine OEM refrigerant metering device engineered for the Goodman ANZ130181AA heat pump. The fixed-orifice piston regulates refrigerant flow into the coil, ensuring correct superheat, efficient heat transfer, and reliable heating and cooling performance. An incorrectly sized or worn piston is a common cause of poor capacity, iced coils, and high energy bills — installing the factory-matched orifice restores the system to its designed specification.

Specifications

OEM Part Number: B1789851
Component Type: Fixed-orifice refrigerant piston / metering device
Compatible Model: Goodman ANZ130181AA
Equipment: Split-system heat pump condenser
Material: Brass orifice with filter screen

OEM vs. Generic

This is a genuine Goodman OEM part with a factory-calibrated orifice bore precisely matched to the ANZ130181AA charge and coil. Generic pistons are cheaper but frequently ship with a nominal bore size that deviates from spec, causing charge and superheat problems. For a metering device, exact bore accuracy matters — we recommend OEM for guaranteed system performance.

Installation Difficulty

Difficulty: Advanced (EPA-certified technician required). Replacing a piston requires recovering the refrigerant, opening the sealed system, swapping the orifice at the liquid line connection, evacuating to a deep vacuum, and recharging by weight or subcooling. This is not a DIY repair — improper handling of refrigerant is illegal without EPA 608 certification and can damage the compressor.

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 K...

$5.95

Frequently Asked Questions

Does this Piston fit my Goodman ANZ130181AA — B1789851?

Yes. This is the factory-specified OEM piston for the Goodman ANZ130181AA — B1789851. 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 ANZ130181AA — B1789851?

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.

Menu