What are the specs for this Piston?

The correct replacement for Goodman model ASZ130361AD Heat Pump — B1789868 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 ASZ130361AD Heat Pump — B1789868.

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 Piston / Flowrator Kit for ASZ130361AD Heat Pump — B1789868

Name: OEM Goodman Piston / Flowrator Kit for ASZ130361AD Heat Pump — B1789868
Brand: Goodman
SKU: GOODMAN-16238
Price: 5.95 USD
Availability: InStock

SKU: GOODMAN-16238 Brand: Goodman

$5.95 $7.95

OEM Guaranteed

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Texas CMBL #19328542014

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The Goodman B1789868 is a genuine OEM piston (flowrator) metering kit for the ASZ130361AD 3-ton heat pump. This precision-bored orifice regulates refrigerant flow into the coil, and its exact bore size is matched to the unit's capacity and refrigerant charge to deliver correct superheat, subcooling, and rated efficiency.

Using the wrong piston size — or a worn, debris-clogged one — leads to poor heating and cooling performance, high head pressure, or compressor strain. This inexpensive kit is essential during coil or line-set replacement and any time the metering device is suspect.

Specifications

OEM Part Number: B1789868
Fits: Goodman ASZ130361AD heat pump
Type: Fixed-orifice piston / flowrator metering device
Application: Refrigerant metering at the coil inlet
Bore: Factory-sized for ASZ13 3-ton capacity
Brand: Goodman (genuine OEM)

OEM vs. Generic

Generic assorted-piston packs require you to identify the correct bore yourself, and an incorrect size quietly robs capacity and efficiency. The OEM B1789868 is pre-matched to the ASZ130361AD, removing sizing guesswork and protecting the compressor.

Install Difficulty

Professional (4/5). Requires EPA Section 608 certification — the system must be recovered, the metering device opened, the piston swapped, then evacuated and recharged. Best left to a licensed HVAC technician; not a DIY 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 Piston / Flowrator K...

$5.95

Frequently Asked Questions

Does this Piston fit my Goodman ASZ130361AD Heat Pump — B1789868?

Yes. This is the factory-specified OEM piston for the Goodman ASZ130361AD Heat Pump — B1789868. 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 ASZ130361AD Heat Pump — B1789868?

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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