What are the specs for this Piston?

The correct replacement for Goodman model ASZ130241AG Heat Pump — B1789857 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 ASZ130241AG Heat Pump — B1789857.

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 Metering Piston Kit for ASZ130241AG Heat Pump — B1789857

Name: OEM Goodman Metering Piston Kit for ASZ130241AG Heat Pump — B1789857
Brand: Goodman
SKU: GOODMAN-16178
Price: 5.95 USD
Availability: InStock

SKU: GOODMAN-16178 Brand: Goodman

$5.95 $7.95

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OEM Goodman Metering Piston Kit — Part B1789857

Dial in correct refrigerant flow with the genuine Goodman B1789857 metering piston (flowrator) kit, a direct-fit component for the ASZ130241AG 2-ton 13 SEER heat pump. This precision-drilled orifice seats in the liquid line coupling and controls refrigerant flow into the coil, setting proper superheat and system efficiency. Correct piston sizing is essential whenever a coil, compressor, or metering device is serviced.

Specifications

Part number: B1789857
Component: Metering piston / orifice (flowrator) kit
Fits: Goodman ASZ130241AG heat pump (2-ton nominal)
Function: Fixed-orifice refrigerant metering
Refrigerant: Factory-drilled for R-410A charge
Includes: Piston and seals for OEM coupling

OEM vs. Generic

The OEM B1789857 is bored to Goodman's exact orifice diameter for this tonnage, so superheat and subcooling land where the engineering spec intends. An incorrectly sized generic piston causes flooding or starving of the coil, poor capacity, and possible compressor damage. At this price, matching the factory orifice is a clear win.

Installation Difficulty

Advanced (4/5) — professional recommended. Requires refrigerant recovery, opening the liquid-line coupling to swap the piston, evacuation, and recharge. Sealed-system service that should be handled by a licensed, EPA-certified 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 Metering Piston Kit ...

$5.95

Frequently Asked Questions

Does this Piston fit my Goodman ASZ130241AG Heat Pump — B1789857?

Yes. This is the factory-specified OEM piston for the Goodman ASZ130241AG Heat Pump — B1789857. 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 ASZ130241AG Heat Pump — B1789857?

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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