What are the specs for this Piston?

The correct replacement for Goodman model ASZ130301AG Heat Pump — B1789865 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 ASZ130301AG Heat Pump — B1789865.

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 ASZ130301AG Heat Pump — B1789865

Name: OEM Goodman Piston / Flowrator Kit for ASZ130301AG Heat Pump — B1789865
Brand: Goodman
SKU: GOODMAN-16211
Price: 6.95 USD
Availability: InStock

SKU: GOODMAN-16211 Brand: Goodman

$6.95 $9.49

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Goodman B1789865 Piston (Flowrator) Kit

The B1789865 is a genuine OEM refrigerant metering piston — often called a flowrator — designed for the Goodman ASZ130301AG 13 SEER, 2.5-ton heat pump. The piston seats inside the metering device body and controls the precise flow of R-410A into the coil. Its fixed orifice diameter is matched to the tonnage of the unit; using the wrong bore size causes flooding or starvation, poor subcooling, and lost capacity in both heating and cooling modes.

Specifications

Part type: Fixed-orifice metering piston / flowrator
OEM part number: B1789865
Fits: Goodman ASZ130301AG (2.5 ton / 30,000 BTU heat pump)
Refrigerant: R-410A
Orifice: Factory-drilled to ASZ13 2.5-ton spec
Includes: Piston and Teflon seal ring

OEM vs. Generic

The OEM B1789865 ships with the exact bore size Goodman specifies for this coil-and-condenser pairing. Generic piston assortments are inexpensive but require you to cross-reference the correct drill size — an easy place to introduce a performance fault. At this price point, the OEM piston removes the guesswork.

Installation Difficulty

Advanced (4/5) — Requires EPA 608 certification. The refrigerant must be recovered, the metering device body opened, the piston swapped and re-sealed, then the system evacuated and recharged. Small part, but it lives inside the sealed refrigerant circuit — leave it to a licensed 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 / Flowrator K...

$6.95

Frequently Asked Questions

Does this Piston fit my Goodman ASZ130301AG Heat Pump — B1789865?

Yes. This is the factory-specified OEM piston for the Goodman ASZ130301AG Heat Pump — B1789865. 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 ASZ130301AG Heat Pump — B1789865?

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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