Technical Foundation
What Is a Flexible Gas Hose?
A flexible gas hose (also called a gas connector) is a corrugated stainless steel or coated tube that connects a fixed gas supply line to an appliance or piece of equipment, absorbing vibration and allowing limited repositioning that rigid pipe cannot. The corrugated construction gives the hose flexibility along its length while the stainless steel resists corrosion from the gas and ambient moisture, and connectors are rated by maximum gas flow capacity (BTU/hr) at a given length and diameter, not just by physical diameter alone.
End fittings must match both the appliance's connection thread and the supply line's shutoff valve outlet — most residential and light commercial connectors use standard NPT threads, while commercial kitchen equipment on casters commonly adds a quick-disconnect fitting and a mandatory restraining cable so the flexible connector isn't the only thing holding the appliance's gas supply secure when the equipment is moved for cleaning.
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| Spec | What It Means | Why It Matters |
|---|---|---|
| Diameter | 3/8 in, 1/2 in, 3/4 in, 1 in common sizes | Must match required BTU/hr flow rate for the appliance at the connector's rated length |
| Length | Sized to the actual gap between shutoff and appliance | Excess unsupported length risks kinking or abrasion; too short prevents proper connection |
| Material | Corrugated stainless steel, coated/lined variants | Stainless resists corrosion; coated variants add abrasion resistance in commercial kitchen use |
| Gas Type Rating | Natural gas, propane (LP) | Connector and any yellow coating/rating must be listed for the specific gas type in use |
| End Fitting | NPT thread, quick-disconnect with restraint cable | Quick-disconnect fittings on movable equipment require a restraining cable per code |
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Applications
Where Flexible Gas Hoses Get Used
Flexible gas hoses are specified anywhere an appliance or piece of equipment needs a gas connection that accommodates minor movement, vibration or repositioning that rigid pipe can't.
Residential Appliance Installation
Flexible connectors linking gas ranges, dryers and water heaters to their supply shutoff valves.
Commercial Kitchen Equipment
Quick-disconnect gas connectors with restraining cables on movable ranges and griddles for cleaning access.
Propane-Fueled Equipment
Flexible propane connectors on generators, heaters and outdoor cooking equipment.
HVAC Equipment Installation
Flexible gas connectors linking furnaces and rooftop units to building gas supply lines.
Facilities Maintenance
Replacement gas connectors during appliance swaps and routine equipment maintenance.
FAQ
Flexible Gas Hoses Questions, Answered
How do I choose the right diameter flexible gas connector?
Diameter must be sized to deliver the appliance's rated BTU/hr demand at the connector's actual length — manufacturers publish capacity tables showing maximum BTU/hr by diameter and length, since a longer run of the same diameter delivers less flow than a shorter one due to pressure drop.
Can I use the same gas connector for natural gas and propane?
Only if the connector is specifically listed for both gas types — check the printed rating on the connector itself. Some connectors are rated for natural gas only, and using an unlisted connector with propane (which operates at different pressure characteristics) is not a safe substitution.
Why do commercial kitchen gas connectors need a restraining cable?
Movable kitchen equipment on casters uses a quick-disconnect gas fitting so the appliance can be pulled out for cleaning, but code typically requires a separate restraining cable to prevent the equipment from being pulled far enough to over-stress or disconnect the flexible gas connector itself during that movement.
How long can a flexible gas connector be?
Length should be sized to the actual distance between the shutoff valve and the appliance connection with enough slack for normal appliance movement, but excess unsupported length increases the risk of kinking, abrasion against other surfaces, or physical damage — it shouldn't be used as a substitute for properly routed rigid pipe over long distances.
Are flexible gas connectors reusable when an appliance is replaced?
Many manufacturers and codes recommend against reusing a flexible connector when an appliance is disconnected and reconnected, since repeated bending and fitting makeup can fatigue the corrugated material or fitting seal — installing a new connector with each appliance change is the safer standard practice.
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