What are the specs for this Piston / Metering Device?

The correct replacement for Goodman model ASZ130241BA — 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 ASZ130241BA — B1789857.

What symptoms indicate I need a new piston / metering device?

Common symptoms that indicate you need a new piston / metering device include unusual noises, intermittent operation, complete failure to operate, or visible damage. For specific diagnostic guidance, visit nationalhvacparts.com/pages/hvac-diagnostic.

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Goodman

OEM Goodman Piston / Flowrator Kit for ASZ130241BA — B1789857

Name: OEM Goodman Piston / Flowrator Kit for ASZ130241BA — B1789857
Brand: Goodman
SKU: GOODMAN-16186
Price: 5.95 USD
Availability: InStock

SKU: GOODMAN-16186 Brand: Goodman

$5.95 $7.95

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Texas CMBL #19328542014

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The Goodman B1789857 Piston Kit (flowrator/orifice) is a genuine OEM refrigerant metering device for the ASZ130241BA heat pump and matched Goodman/Amana indoor coils. The piston is a precision-drilled orifice that meters liquid refrigerant into the evaporator or condenser coil, setting the superheat and subcooling the system was designed around. Correct piston size is essential for rated capacity and efficiency.

Specifications

Part Number: B1789857 (OEM Goodman)
Type: Piston / flowrator metering orifice
Equipment: Heat Pump
Primary Fit: ASZ130241BA
Function: Refrigerant metering (fixed orifice)
Includes: Piston and seal/o-ring as supplied

OEM vs. Generic

Piston orifice diameter is model-specific — even a few thousandths of an inch off changes superheat and can starve or flood the coil. The genuine B1789857 is drilled to Goodman's factory spec for the ASZ130241BA, guaranteeing rated performance. Aftermarket piston sets require you to select and verify the orifice size yourself, adding risk of a mismatched charge.

Installation Difficulty

Intermediate to Advanced. The piston lives inside the liquid-line flare connection at the coil or distributor. Replacement requires recovering refrigerant, opening the flare joint, swapping the piston with a fresh seal, and re-evacuating/recharging. EPA-certified refrigerant handling required.

A low-cost genuine part that protects the far more expensive compressor and coil.

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 / Metering Device fit my Goodman ASZ130241BA — B1789857?

Yes. This is the factory-specified OEM piston / metering device for the Goodman ASZ130241BA — 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 / metering device on my Goodman ASZ130241BA — 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 / metering device?

Common symptoms: unusual noises, intermittent operation, complete failure, or visible damage. Visit our diagnostic hub for symptom-based troubleshooting.

Is this piston / metering device 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 / metering device?

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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