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ANSI Z21.73-2017 / CSA 11.1-2017: Connectors for Outdoor Gas Appliances and Manufactured Home Parks – Technical Overview
Ensuring Safety and Performance in Gas Connector Systems for Outdoor and Manufactured Home Applications
Scope and Application
ANSI Z21.73-2017 / CSA 11.1-2017 establishes uniform requirements for connectors used to convey fuel gas (natural gas, manufactured gas, mixed gas, liquefied petroleum gas, and LP gas-air mixtures) to outdoor gas appliances and to manufactured (mobile) homes located in parks. The standard covers both factory-assembled flexible connectors and quick-disconnect devices (QDDs) that form part of the gas supply system. It does not apply to connector components used indoors, for which other standards (e.g., ANSI Z21.24 / CSA 6.10) apply.
The scope includes two main product categories:
- Outdoor appliance connectors – for gas grills, patio heaters, outdoor fire pits, and similar appliances rated for outdoor use.
- Manufactured home park connectors – semi-permanent or flexible connectors that link the gas riser to the home’s regulator or piping.
Each category must satisfy specific construction, performance, and marking requirements as set forth in the standard. The document also references relevant national codes such as the National Fuel Gas Code (NFPA 54 / ANSI Z223.1) and the Canadian Fuel Gas Code (CSA B149.1) for installation guidelines.
Tip: When selecting connectors, ensure they are certified by a Nationally Recognized Testing Laboratory (NRTL) in the United States or by an accredited certification body such as CSA Group in Canada. This provides assurance that the product meets the safety and performance criteria of ANSI Z21.73-2017 / CSA 11.1-2017.
Technical Requirements
Materials and Construction
Connectors must be fabricated from corrosion-resistant materials. Metal components are typically brass, stainless steel, or carbon steel with corrosion protection. Polymer seals and gaskets must remain flexible and non-degrading at extreme service temperatures (−40°F to +250°F). Threaded ends must conform to ASME B1.20.1 (National Pipe Thread) or ASME B1.20.7 (for hose connector threads).
Pressure and Leakage Tests
Every connector design is required to pass a hydrostatic strength test and a gas leakage test before being marked as compliant. The key test parameters are summarized in the table below.
| Test Type | Criteria | Applicable Connectors |
|---|---|---|
| Hydrostatic Strength | 3 × rated pressure for 1 minute without leakage or rupture | All types |
| Gas Leakage | No leakage at 0.5 psig or rated pressure (whichever is lower) for 5 minutes | All types |
| Flexure (Cyclic Bending) | 500–1,000 cycles without visible damage or leakage | Flexible connectors only |
| Tensile Strength | 4 × rated load for quick-disconnect devices (engaged); 500 lb for disengaged | QDDs |
| Corrosion Resistance | Accelerated salt spray test per ASTM B117, 96 hours minimum | All metal parts |
Additionally, connectors intended for liquefied petroleum gas may require higher pressure ratings and special elastomers to resist swelling. Manufacturers must validate performance at both minimum and maximum service temperatures.
Warning: Using a connector not rated for the specific gas type or operating pressure can lead to leaks, fires, or explosions. Always confirm the connector marking matches the gas system design.
Implementation Highlights
Selection and Sizing
Connectors must be sized based on the appliance BTU input and the length of the run to prevent excessive pressure drop. The standard provides pressure drop tables for various connector lengths and diameters. Installers should consult the connector manufacturer’s sizing charts.
Installation Practices
Flexible connectors should not be kinked, twisted, or subjected to sharp bends. Quick-disconnect devices must be installed so that the valve is accessible and the breakaway force is not inadvertently exceeded. The standard requires that each connector be supplied with installation instructions that include torque values for threaded connections and warnings about inadvertent disconnection.
Marking and Documentation
Each connector must be permanently marked with the manufacturer’s name, model number, gas type, rated pressure (psi or kPa), maximum temperature range, and the certification mark of the testing agency. The standard also requires the inclusion of a statement such as “FOR OUTDOOR USE ONLY” or “FOR MANUFACTURED HOME PARK USE” as applicable.
Success: Connectors bearing the certification mark of CSA or an NRTL and complying with ANSI Z21.73-2017 / CSA 11.1-2017 provide reliable gas connections when installed per the manufacturer’s instructions and local codes.
Compliance and Certification
ANSI Z21.73-2017 / CSA 11.1-2017 is harmonized between the United States and Canada. Manufacturers seeking to market connectors in both countries should pursue joint certification through the CSA / ANSI process. Third-party testing and initial factory inspection are required, followed by periodic surveillance inspections at least once per year.
Compliance notes include:
- The standard references ANSI Z21.41 / CSA 6.9 for quick-disconnect devices used in conjunction with the connector.
- Connectors for manufactured home parks must also meet the mobile home construction requirements of HUD Title 24 CFR Part 3280.
- All connectors must carry a pressure rating clearly indicated on the product and packaging.
- Field modifications (e.g., cutting flexible hoses) void the certification unless specifically allowed in the manufacturer’s instructions.
- Users should periodically inspect connectors for corrosion, cracks, or leakage, especially after severe weather or physical disturbance.
Danger: Never use a connector that shows signs of corrosion, kinking, cracking, or damage. Replace it immediately with a certified product. A compromised gas connector can lead to catastrophic failure.
Frequently Asked Questions
Q: What is the scope of ANSI Z21.73-2017 / CSA 11.1-2017?
A: The standard covers connectors for outdoor gas appliances (grills, patio heaters, etc.) and connectors for manufactured home parks. It includes both flexible metal connectors and quick-disconnect devices used in these applications. Connectors for indoor appliances are covered by different standards (e.g., ANSI Z21.24 / CSA 6.10).
A: The standard covers connectors for outdoor gas appliances (grills, patio heaters, etc.) and connectors for manufactured home parks. It includes both flexible metal connectors and quick-disconnect devices used in these applications. Connectors for indoor appliances are covered by different standards (e.g., ANSI Z21.24 / CSA 6.10).
Q: Are these connectors required to be certified by a third-party agency?
A: Yes. Most local building codes and the National Fuel Gas Code (NFPA 54) require that connectors for gas appliances be certified by an accredited certification body. In the US this is typically an NRTL such as CSA Group or UL; in Canada, certification by CSA Group or another accredited agency is mandatory.
A: Yes. Most local building codes and the National Fuel Gas Code (NFPA 54) require that connectors for gas appliances be certified by an accredited certification body. In the US this is typically an NRTL such as CSA Group or UL; in Canada, certification by CSA Group or another accredited agency is mandatory.
Q: What gases are covered by this standard?
A: The standard covers connectors for natural gas, manufactured gas, mixed gas, liquefied petroleum gas (propane), and LP gas-air mixtures. The specific gas type must be marked on the connector and the elastomers must be compatible with the intended fuel.
A: The standard covers connectors for natural gas, manufactured gas, mixed gas, liquefied petroleum gas (propane), and LP gas-air mixtures. The specific gas type must be marked on the connector and the elastomers must be compatible with the intended fuel.
Q: Can I use a connector from this standard for an indoor gas appliance?
A: No. ANSI Z21.73-2017 / CSA 11.1-2017 is specifically for outdoor appliances and manufactured home park connections. Indoor connector requirements are different (e.g., ANSI Z21.24 for residential indoor connectors). Using an outdoor-rated connector indoors may violate code and could create a safety hazard due to different temperature and space constraints.
A: No. ANSI Z21.73-2017 / CSA 11.1-2017 is specifically for outdoor appliances and manufactured home park connections. Indoor connector requirements are different (e.g., ANSI Z21.24 for residential indoor connectors). Using an outdoor-rated connector indoors may violate code and could create a safety hazard due to different temperature and space constraints.
Footer note: This article is based on ANSI Z21.73-2017 (CSA 11.1-2017) and is intended for informational purposes. For the full text and authoritative requirements, refer to the latest edition published by CSA Group or ANSI. — Published: 2026