Flexible gas connector corrugated tubing, stainless steel - with defects to be discussed (C) Daniel Friedman LP Gas & Natural Gas Flexible Connector Install
Installation, inspection & safety warnings for flexible gas connectors used with appliances & heating equipment

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Flexible gas connector installation: how to select & install a flexible connector for gas fueled appliances or heating equipment.

This article summarizes manufacturer's advice for the selection & installation of flexible gas connector tubing to assure adequate gas flow to support the input BTUH rating of the connected appliance, and to avoid some common sources of gas leaks such as stretching, vibration, or mechanical damage to the tubing.

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Flexible Gas Appliance Connector Installation Procedures & Warnings

Flexible corrugated gas connector tubing, stainless steel, un-coated, missing shutoff valve (C) Daniel FriedmanThe manufacturer typically warns of the following safety hazards when using flexible gas connector tubing, mostly in the form of "Do Not" admonitions:

Coated stainless steel gas connector for appliances or heaters (C) Daniel Friedman

Table of Flexible Gas Connector Lengths & Diameters vs. BTUs

Tubing Inside Diameter Tubing Color Code Tubing Lengths in Inches vs. Capacity in BTUH
(1000 Input BTUs per Hour of the Appliance)
12" 18" 24" 30" 36" 48"* 60"* 72"*
1/4" Purple
48.0 43.8 40.0 36.4 33.4 28.3 24.9 23.1
3/8" Green
102 93.1 85.5 77.1 71.1 60.5 53.2 48.1
1/2" Gold (yellow)
180 164.2 150 136 125 106 93.2 86


1. * = not permitted in some jurisdictions such as Massachusetts

2. Straight tubing length capacity in BTUs per Hour is based on the assumption of natural gas at 0.64 specific gravity with a heating value of 1,600 BTUs per cubic foot of gas. 1KBTUH = 1SCFH (standard cubic feet per hour). Multiply the BTUs shown in the table by 0.632 to convert to standard capacity of 50 pa (0.02 in water column) pressure drop. Some reduction in gas flow rates will be imparted by the number of bends in the tubing - keep tubing bends as gentle and as few as possible.

3. Watch out: this table is adapted from tubing manufacturers' instruction sheets. Be sure to check the tubing specifications and applications and installation instructions provided by the specific maufacturer of the tubing that you are purchasing.

4. Adapted from product literature from BrassCraft Gas Products, 39600 Orchard Hill Pl, Novi, MI 48375, United States +1 248-305-6000, Website:


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