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ADP 176799976 #76 Piston Orifice – R-410A 4 Ton, R-454B 4 Ton & R-32 5 Ton HVAC Metering Device

Name: ADP 176799976 #76 Piston Orifice – R-410A 4 Ton, R-454B 4 Ton & R-32 5 Ton HVAC Metering Device
Brand: ADP
Price: 25.00 USD
Availability: InStock

Low stock: 1 left

$25.00 USD

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ADP 176799976 #76 piston orifice for compatible HVAC coils. Used in 4-ton R-410A/R-454B and 5-ton R-32 applications.

#76 / .076 fixed refrigerant metering piston
4-ton / 48,000 BTUH application with R-410A
4-ton / 48,000 BTUH application with R-454B
5-ton / 60,000 BTUH application with R-32
OEM ADP metering device for compatible evaporator coils and air handlers

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Specifications

Specification

Details

Brand

ADP – Advanced Distributor Products

Part Number / MPN

176799976

Product Type

Refrigerant Piston / Metering Orifice

Piston Size

#76 / .076

Metering Type

Fixed Orifice

R-410A Application

48,000 BTUH / 4 Ton

R-454B Application

48,000 BTUH / 4 Ton

R-32 Application

60,000 BTUH / 5 Ton

Application

Evaporator Coil / Air Handler

Manufacturer

Advanced Distributor Products

description

The ADP 176799976 is an OEM #76 fixed piston refrigerant metering orifice designed for compatible Advanced Distributor Products (ADP) evaporator coils and air handlers.

The #76 piston controls refrigerant flow into the evaporator coil and is used in different capacity applications depending on the refrigerant. Current ADP documentation lists 176799976 for 48,000 BTUH R-410A, 48,000 BTUH R-454B, and 60,000 BTUH R-32 applications.

Key Features & Function

Advanced Distributor Products (ADP)
Part Number: 176799976
Piston Size: #76 / .076
Fixed-orifice refrigerant metering device
OEM ADP replacement component
Controls refrigerant flow into the evaporator coil
R-410A: 48,000 BTUH / 4 Ton
R-454B: 48,000 BTUH / 4 Ton
R-32: 60,000 BTUH / 5 Ton
Designed for compatible ADP evaporator coils and air handlers

Product Details & Specifications

Specification	Details
Brand	ADP – Advanced Distributor Products
Part Number / MPN	176799976
Product Type	Refrigerant Piston / Metering Orifice
Piston Size	#76 / .076
Metering Type	Fixed Orifice
R-410A Application	48,000 BTUH / 4 Ton
R-454B Application	48,000 BTUH / 4 Ton
R-32 Application	60,000 BTUH / 5 Ton
Application	Evaporator Coil / Air Handler
Manufacturer	Advanced Distributor Products

Current ADP parts documentation confirms the #76 piston and these refrigerant-specific capacity applications.

🛠️ HVAC Depot Pro Tip

Do not choose a piston by tonnage alone. The same #76 piston can be used for different nominal capacities depending on the refrigerant.

For example:

R-410A → 4 Ton
R-454B → 4 Ton
R-32 → 5 Ton

Always verify the outdoor condenser model, evaporator coil model, refrigerant, and manufacturer's required piston size before installation.

Equipment / Model Compatibility

The ADP 176799976 is intended for compatible ADP equipment requiring a #76 fixed-orifice piston, including select:

ADP evaporator coils
ADP air handlers
R-410A systems
R-454B systems
R-32 systems
Fixed-orifice HVAC applications

Exact compatibility should be determined from the indoor/outdoor equipment combination rather than tonnage alone.

Specification

Refund policy

Refund & Return Policy

Last Updated: June 2026

At HVAC Parts & Equipment Depot, customer satisfaction is important to us. This Refund & Return Policy explains how returns, exchanges, and refunds are handled for purchases made through TopHVACParts.com.

Return Eligibility

We accept returns within 30 days of delivery.

To qualify for a return:

The item must be unused, uninstalled, and in its original condition.
The item must be returned in its original packaging.
Model numbers and serial numbers must match the original purchase records.
Proof of purchase or order confirmation is required.

Non-Returnable Items

The following items are not eligible for return or refund:

Installed or used parts.
Products showing signs of installation, modification, or damage caused after delivery.
Items missing original packaging.
Sale or clearance items.
Special-order or custom-order products.
Returns requested more than 30 days after delivery.

Restocking Fee

Approved returns may be subject to a 20% restocking fee.

The restocking fee will be deducted from the refund amount after the returned item has been inspected and approved.

Damaged, Defective, or Incorrect Items

If you receive a damaged, defective, or incorrect item, please contact us within 7 days of delivery.

Email: support@tophvacparts.com
Phone: (214) 734-5222

We may request photographs and additional information to help process your claim.

If the claim is approved, we will provide a replacement, exchange, or refund at no additional cost to you.

Exchanges

We replace items only if they are defective, damaged upon arrival, or incorrectly shipped.

To request an exchange, contact us at:

support@tophvacparts.com

Refund Process

Once your return is received and inspected, we will notify you by email regarding approval or rejection of your refund request.

If approved:

Refunds will be issued to the original payment method.
Processing typically takes 7–14 business days after approval.
Your financial institution may require additional time before the refund appears in your account.

Return Shipping

Customers are responsible for return shipping costs unless the return is the result of:

Our shipping error,
A defective product,
A damaged product received upon delivery.

Original shipping charges are non-refundable.

We recommend using a trackable shipping service and purchasing shipping insurance for higher-value items.

Return Address

HVAC Parts & Equipment Depot
1135 E Plano Parkway, Suite 8
Plano, TX 75074
United States

Professional Installation Notice

Many HVAC products require installation by a licensed HVAC professional.

HVAC Parts & Equipment Depot is not responsible for damages resulting from improper installation, misuse, unauthorized modifications, or failure to follow manufacturer instructions.

Special Orders

Special-order products must be picked up within 30 days of purchase unless other arrangements have been approved.

Unclaimed special-order products may be returned to the manufacturer and may be subject to applicable restocking fees.

Contact Us

If you have questions regarding returns, refunds, or exchanges, please contact us:

HVAC Parts & Equipment Depot

Phone: (214) 734-5222
Email: support@tophvacparts.com

Refund & Return Policy

Last Updated: June 2026

Return Eligibility

We accept returns within 30 days of delivery.

To qualify for a return:

The item must be unused, uninstalled, and in its original condition.
The item must be returned in its original packaging.
Model numbers and serial numbers must match the original purchase records.
Proof of purchase or order confirmation is required.

Non-Returnable Items

The following items are not eligible for return or refund:

Installed or used parts.
Products showing signs of installation, modification, or damage caused after delivery.
Items missing original packaging.
Sale or clearance items.
Special-order or custom-order products.
Returns requested more than 30 days after delivery.

Restocking Fee

Approved returns may be subject to a 20% restocking fee.

The restocking fee will be deducted from the refund amount after the returned item has been inspected and approved.

Damaged, Defective, or Incorrect Items

If you receive a damaged, defective, or incorrect item, please contact us within 7 days of delivery.

Email: support@tophvacparts.com
Phone: (214) 734-5222

We may request photographs and additional information to help process your claim.

If the claim is approved, we will provide a replacement, exchange, or refund at no additional cost to you.

Exchanges

We replace items only if they are defective, damaged upon arrival, or incorrectly shipped.

To request an exchange, contact us at:

support@tophvacparts.com

Refund Process

Once your return is received and inspected, we will notify you by email regarding approval or rejection of your refund request.

If approved:

Refunds will be issued to the original payment method.
Processing typically takes 7–14 business days after approval.
Your financial institution may require additional time before the refund appears in your account.

Return Shipping

Customers are responsible for return shipping costs unless the return is the result of:

Our shipping error,
A defective product,
A damaged product received upon delivery.

Original shipping charges are non-refundable.

We recommend using a trackable shipping service and purchasing shipping insurance for higher-value items.

Return Address

HVAC Parts & Equipment Depot
1135 E Plano Parkway, Suite 8
Plano, TX 75074
United States

Professional Installation Notice

Many HVAC products require installation by a licensed HVAC professional.

HVAC Parts & Equipment Depot is not responsible for damages resulting from improper installation, misuse, unauthorized modifications, or failure to follow manufacturer instructions.

Special Orders

Special-order products must be picked up within 30 days of purchase unless other arrangements have been approved.

Unclaimed special-order products may be returned to the manufacturer and may be subject to applicable restocking fees.

Contact Us

If you have questions regarding returns, refunds, or exchanges, please contact us:

HVAC Parts & Equipment Depot

Phone: (214) 734-5222
Email: support@tophvacparts.com

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ADP 176799976 #76 Piston Orifice – R-410A 4 Ton, R-454B 4 Ton & R-32 5 Ton HVAC Metering Device