What are the specs for this Valve?

The correct replacement for Lennox model OEM Lennox Valve-Expansion — 99K40 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 Lennox equipment which lists the model number OEM Lennox Valve-Expansion — 99K40.

What symptoms indicate I need a new valve?

Common symptoms that indicate you need a new valve 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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Lennox

OEM Lennox Valve-Expansion — 99K40

Name: OEM Lennox Valve-Expansion — 99K40
Brand: Lennox
SKU: LNX-99K40
Price: 59.95 USD
Availability: InStock

SKU: LNX-99K40 Brand: Lennox

$59.95 $84.95

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The Lennox 99K40 is a genuine OEM expansion valve engineered to meter refrigerant into the evaporator coil with precision, maintaining the ideal system pressures required for efficient Lennox HVAC operation. Common signs of expansion valve failure include loss of cooling capacity, frost buildup on refrigerant lines, or unusual pressure readings that indicate improper refrigerant flow. This direct OEM replacement ensures a proper fit and function for compatible Lennox systems, offering the reliability and longevity that aftermarket parts cannot guarantee.

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 Lennox Valve-Expansion — 99K40

$59.95

Frequently Asked Questions

Does this Valve fit my Lennox OEM Lennox Valve-Expansion — 99K40?

Yes. This is the factory-specified OEM valve for the Lennox OEM Lennox Valve-Expansion — 99K40. 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 valve on my Lennox OEM Lennox Valve-Expansion — 99K40?

Requires licensed HVAC technician. Gas valve work involves gas lines that must meet local building codes. Improper installation risks dangerous gas leaks. Buy the part yourself to save 40–60% on markup, then have your technician install it.

What symptoms mean I need a new valve?

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

Is this valve compatible with Bryant or Payne too?

Many Lennox 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 Lennox valve?

Always use OEM. Gas valves must match exact pressure ratings, port configurations, and safety certifications. Non-OEM gas valves can create safety hazards and may violate building codes.

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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OEM Lennox Valve-Expansion — 99K40

Shipping Information

Return Policy

Frequently Asked Questions