NPGA Issues Urgent Alert on Potentially Mismarked Interior Gas-Piping Material

By Bill StompPropane InsiderJul 8, 20252 min read

On June 26, 2025, the National Propane Gas Association (NPGA) alerted state propane associations and industry professionals about a potentially mislabeled aluminum pipe product being marketed for interior gas line installations. This alert is intended to prevent unsafe installations and ensure compliance with applicable building codes.

NPGA Issues Urgent Alert on Potentially Mismarked Interior Gas-Piping Material

What’s at Stake

NPGA identified a manufacturer — GasFlex — marketing a piping product labeled as aluminum-only. However, the pipe appears to be constructed using a composite standard typical of PEX/AL/PEX or PE/AL/PE materials. These types of composite piping are not approved for interior gas use unless granted specific approval from the authority having jurisdiction (AHJ).

This misrepresentation may be a strategy to bypass the Alternative Methods Approval (AMA) process required by:

• NFPA 54-2024, Section 1.4
• ICC IFGC-2024, Section 104.2.3
• IAPMO UPC-2024, Section 301.3

While composite piping may be allowed for underground or outdoor use without additional approval, interior applications require AHJ review and authorization.

NPGA’s Call to Action

NPGA urges all members and affiliated state associations to report any appearance or distribution of the GasFlex product in their area. Understanding where this product is being sold or installed is essential for ensuring safety and preventing improper use. Anyone encountering this product is encouraged to notify their state executive immediately to assist NPGA in identifying the scope of its use.

Why This Matters

The use of mismarked or unauthorized piping can lead to several risks:

• Safety Hazards — Improper materials in gas piping systems can result in leaks, failures, or fire hazards.
• Code Violations — Installing unapproved products without the required AMA documentation can breach local and national building codes.
• Legal Liability — Installers and suppliers may face legal consequences if improperly marked products cause system malfunctions or harm.

This issue emphasizes the importance of using properly certified materials for interior gas installations.

Amber marks the 8 states whose LP-gas licensing law still names CETP by name.

Regulations and Guidance

Composite piping must not be installed indoors for gas use unless it has been reviewed and approved by an AHJ under an AMA request. NPGA advises the following:

• Always request AMA approval before installing non-traditional materials indoors.
• Verify product certification with manufacturers before purchase or use.
• Maintain documentation of approvals and certifications to demonstrate compliance.
• Following these steps will do much to ensure both safety and regulatory adherence.

Reporting Instructions

If you identify the GasFlex product or similar mismarked pipe:

• Do not install the product for interior gas piping unless you have received AHJ approval
• Report the instance to your state propane association or NPGA contact
• Share details about where the product was found or sold to assist further investigation

Industry Responsibility

NPGA’s alert reinforces that all parties in the supply chain — including manufacturers, distributors, and installers — must remain vigilant. Mislabeling products undermines safety and threatens industry credibility. By acting now, the propane industry can avoid widespread compliance issues and ensure continued trust in gas piping systems.

Information for this article was provided by the National Propane Gas Association (NPGA).