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Pro-Flex® CSST Flexible Gas Piping

Pro-Flex Corrugated Stainless Steel Tubing (CSST) makes installing gas piping for natural gas or propane gas appliances quick and easy. The Pro-Flex patented fitting system and flexible tubing enables installers to reduce installation time and to eliminate the equipment needed to install gas piping in new or existing construction. Pro-Flex CSST can supply gas throughout a home or commercial building. Route it through walls, floor or ceiling joists, or outside to a variety of appliances.

Click below for detailed view of the Bonding Clamp


Qualified Installer Requirements

To install a Pro-Flex CSST system, installers must meet the following qualifications:

  • The installer must meet all qualifications required by the state and/or local administrative authority administering the provisions of the code where the gas piping is installed.
  • The installer must be trained in the use of the Pro-Flex CSST system accomplished by reading and understanding the information from the Pro-Flex Installation Guide (available by clicking here).

Installer must submit their personal information in the Pro-Flex CSST qualified installer database. A manufacturer’s qualification/training card is required to purchase and install Pro-Flex. The card can be found in the back cover of the installation guide, or downloaded by clicking here, and must be completed and submitted to Pro-Flex, LLC. Before submitting the qualification card, the installer must read and understand this installation guide, which serves as the training program. Should there be any questions related to these installation guidelines or the training process, please contact technical support at 877-798.6291.

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Pro-Flex® Patents, Codes & Standards


  • System Patents include #5,845,946; #5,857,716; and #6,102,445.
  • Special Termination Plate with fitting attached, Patent #6,488, 316.
  • Other Patents Pending


  • ANSI LCIa-2009, CSA 6.26a-2009
  • ANSI LCI-2005 and CSA 6.26-2005, “Fuel Gas Piping Systems Using Corrugated Stainless Steel Tubing (CSST).”
  • Pro-Flex, LLC is an ANSI/ ISO/ ASQ 9001-2000 and ISO 14001 registered company.


  • CSA – CSA International – Certificate #189768 – #1174673
  • IAPMO – International Association of Plumbing & Mechanical Officials – File #3669

Code Compliances:

  • ANSI/CSA LC-1-2005 Fuel Gas Piping Systems Using Corrugated Stainless Steel Tubing
  • National Standard of Canada – Nationals Gas & Propane Installation Code, CAN/CGA-B149.1 &149.2
  • NFPA- National Fuel Gas Code (NFPA 54)
  • BOCA- National Mechanical code
  • CABO- 1&2 Family Dwelling
  • SBCCI – Southern Building Code Congress International “standard gas code”
  • ICC- International Mechanical Code
  • IAPMO – International Association of Plumbing and Mechanical Officials – File #3669
  • UMC – Uniform Mechanical Code

REMEMBER: When a conflict exists between the Pro-Flex Installation Guide and local requirements, the local codes take precedence. The installation must be made in accordance with local codes, or in the absence of local codes, in accordance with the National Fuel Gas Code, ANSI Z223.1/NFPA 54; Natural Gas and Propane Installation code, CSA B149.1 and B149.2 in Canada; the International Fuel Gas Code; the Federal Manufactured Home Construction and Safety Standard, 24 CFR Part 3280; the Manufactured Housing Construction and Safety Standards, ICC/ANSI 2.0; or the Standard on Manufactured Housing, NFPA 501; as applicable.

Pro-Flex, LLC cannot guarantee that the local administrative authority will accept the most recent version of these codes. It is the ultimate responsibility of the qualified installer to determine suitability and acceptance of any building components including gas piping. Pro-Flex® LLC assumes no responsibility for labor or material for installations made without prior determination of local code authority acceptance.


Improper installation or operation of the system may result in fire, explosion, or asphyxiation. Only the components provided or specified by Pro-Flex® as part of a fuel gas system are to be used in the installation. Use of components from other flexible gas piping systems, other than those specified as part of the Pro-Flex® system, is prohibited and may result in poor system performance, serious bodily injury, or property damage.


Click on any image to view product information.
Installation Guide
Bonding Clamp
Male Adapters
Female Adapter
Union Adapters
Special Termination Plate with Adapter
Termination Plate
Striker Plates
Accessory Packs
Single Appliance Gas Kits

Places to Buy

Available at select Lowe’s Stores. Please check your local store for availability.

Distributor – Latin America

Maximo Supply Corp.

Catalog Web Availability:


Air Conditioning Dist., Inc. - Gardena
Refrigeration Supplies Dist - Lake Forest
Geary Pacific Corp. - Orange


Empire Gas & Electric Equip Co - Denver


Allen’s Plumbing Supply - Seymour


Wool Plumbing Supply - Sunrise
Tru Temp Controls Inc - Lakeland
Tempaco - Orlando


New Energy Distributing - Dyersville


Silver Creek Supply – Boise - Boise




Winnelson - Bedford


York/Johnson Controls, Inc. - Wichita
McLiney Lumber Co, LLC #462 - Prairie Village


Wholesale Heating Supply - Dearborn Heights
Hamilton Engineering - Livonia
Wholesale Heating Supply Co - Livonia
Carr Supply Livonia - Livonia
Wholesale Heating Supply Co - Pontiac
Johnstone Supply - Muskegon




Sutherland/Cimarron Lumber & Supply Co. - Kansas City

North Carolina

Diversified Energy LLC Store #5 - Wilmington
Raymond Supply Co. (Rayco) - Winston-Salem
Diversified Energy Store#4 - Shallotte
Fireside Hearth & Home - Cary
Southeast Fireplace Inc - Zebulon
Best & Langston, Inc. - Goldsboro
Strick’s LP Gas - Castle Hane

North Dakota



Air Management - La Vista

New York

Town & Country Heating Supply, Inc - Canandaigua
Adams Heating Supply Company - Schenectady
Hearth Cabinets & More LTD - Liverpool
Krell Distributing Co., Inc. - Syracuse


Habegger - Lima
Habegger - Upper Sandusky
Habegger - Chillicothe
Habegger - Cincinnati-Enterprise Park Dr.
Habegger - Cincinnati-Winton Rd.
Habegger - Columbus
TTI Maumee Equipment, Inc. - Perrysburg
Commercial Specialists - Cincinatti
Palmer-Donavin Mfg. Co. - Columbus
Habegger Corp - Zanesville
Morrow Control & Supply - Canton
Hearth Products Controls Co. - Kettering
Winnelson - Dayton

Ontario, Canada

Comfort Connections - Markham
Southern Supplies LTD. - Oshawa
Trent Metals Limited - Peterborough
Versa Fittings & Mfg Inc - Mississauga


Geary Pacific Corp. - Portland
Jerry’s Home Improvement - Eugene
Mar-Hy Distributors - Milwaukie
AIREFCO INC. - Tualatin


Habegger-Meyer - Erie
Habegger-Meyer - Cranberry
Habegger-Meyer - Duquesne
Woody’s Fireplace Inc - Larksville
Jenkins & McMahon Supply, Inc - Toughkenamon
Folcarelli Supply Company - Altoona
H & H Supply II, Inc. - Dubois
Tom Antonelli, Inc - Bristol
National Plumbing & Htg Supply - Beaver Falls
H & H Supply - Punxsutawney

South Carolina

Southern Propane Services - Orangeburg
Tim’s Gas Depot - Irmo

South Dakota



Furr Building Materials, Inc - Mineral Wells
Goodman Dist. - Houston


Allred’s Inc - Midvale


A & J Supply, Inc. - Williamsburg
Air Cold /Webb Dist. #1401 SAC - Hampton
Virginia Air - Midlothian
Revere Gas - Hartfield


Thermal Supply Inc - Seattle


Connors Supply Co., Inc. - Janesville
The Energy Shop, Inc - Green Bay
Menards - West Milwaukee

West Virginia

Habegger-Meyer - Morgantown




Q: The retainer ring will not close all the way around the pipe. Is it defective?

A: It is not defective. The retainer ring is made to expand and close around the corrugations of Pro‐Flex. As long as it is closed enough for the fitting to fit around the rings then it is attached properly. It is intended to provide adequate spacing for the components of the fittings to attach properly.

Q: Do you need special tools to install the Pro‐Flex CSST system?

A: No special tools are required. To cut Pro‐Flex® CSST you use standard tube cutters. The fittings can be hand-tightened and then it is recommended to tighten a bit more with a ¼ turn using a crescent wrench.

Q: Is Pro‐Flex® available for use in my area and in all states?

A: Pro‐Flex® is available for commercial and residential installation in all states except Massachusetts. The Canadian Standards Association also approves Pro‐Flex® for use in single‐family, multi‐ family, commercial and industrial applications. However, local jurisdictions must be consulted to confirm as the local requirements trump state and national codes.

Q: Is this product certified by CSA/ AGA and/ or UL?

A: This product is certified and must be installed in accordance with local codes, or, in the absence of local codes, in accordance with National Fuel Gas Code, ANSI Z223.1/NFPA 54; Natural Gas and Propane Installation Code, CSA B149.1 & B149.2 in Canada; the International Fuel Gas Code; the Federal Manufactured Home Construction and Safety Standard, 24 CFR Part 3280; the Manufactured Housing Construction and Safety Standards, ICC/ANSI 2.0; or the Standard on Manufactured Housing, NFPA 501; as applicable. UL approval not required.

Q: Do I need to use the fittings with the CSST pipe from Pro‐Flex?

A: Pro-Flex fittings will connect to other gas piping components via the national pipe threads. Pro-Flex CSST Fittings will not connect directly to other brands of CSST tubing and their fittings will not directly connect to Pro-Flex tubing.

Q: Do you need to be certified to install this product?

A: First, the installer must meet all qualifications of a gas installer required by the state and/ or local administrative authority administering the provisions of the code where gas piping is installed. In addition, the installer must be qualified as a Pro-Flex installer. Pro-Flex relies on a self-training approach to achieve Pro-Flex qualified installer status. Within each Pro‐Flex® Training/ Installation Guide you will find all of the information related to installing Pro‐Flex® CSST. Read through the book to understand what is required and how to install this product correctly before installation takes place. In the back of the book you will find two qualified installer’s cards. One you fill out and mail back to Pro-Flex, LLC (or the parent company of Pro‐Flex® CSST, Tru-Flex Metal Hose) and the other you will keep showing the in‐store representative that you are indeed a qualified installer of this product upon purchasing more Pro‐Flex® CSST. You can also complete the qualified installer process on-line at

Q: Can Pro‐Flex® be used in applications with medium‐ or high‐pressure gas?

A: Pro‐Flex® is approved for both medium‐ and high‐pressure gas piping with a 5psi limit.

Q: What type of bonding clamp should be used?

A: Please purchase a Pro‐Flex® bonding clamp at your local hardware retailer. If one is not available for purchase, any UL‐467‐approved bonding clamp can be used.

Q: Is Pro‐Flex® considered bonded if it is connected to an appliance?

A: No. Pro‐Flex® requires that the first fitting after the meter in the CSST product (or another part of the gas piping system near the gas entrance) be directly bonded to the electrical panel with a 6 AWG wire using the instructions provided in each installation/training guide and packet of fittings. Please follow these instructions and ensure that Pro‐Flex® CSST is properly bonded per your local jurisdiction.

Q: Is Pro‐Flex® required to be bonded?

A: In accordance with the NFPA 54 Section 7.13, Pro-Flex, LLC, requires proper bonding of the Pro‐Flex® gas‐piping systems in a structure to the structure’s electrical grounding system. This must be performed by a qualified person recognized by the local jurisdiction as capable of performing such work. These requirements are for all Pro‐Flex® CSST installations.

Q: Can you bury the CSST?

A: Yes, but only within a leak-proof conduit. The conduit can be comprised of either a PVC or metal material which can endure the corrosive contents already in the ground or applied to the ground. Many times chemicals will be poured into the ground and the potential of corrosion to CSST becomes present. Burying it inside of a protective conduit eliminates this risk and protects against unintentional mechanical damage.

Q: How does Pro‐Flex® vary from other CSST systems?

  • Pro‐Flex® fittings are easy to assemble/install. No special tools are required and no flaring is required.
  • Our fittings are THE ONLY DUAL SEALED FITTINGS FOR ADDED SAFETY! Our proprietary High‐Temperature Gasket and Silicone O‐Ring will withstand extreme heat and cold temperatures and has been tested for longevity. All fittings and component parts are certified by CSA to the ANSI LC‐1‐2005, CSA 6.26‐2005 standards.
  • Pro‐Flex® has the only CSST fittings and components that are reusable.
  • Pro‐Flex® flexible piping is annealed to give better flexibility without altering the strength of the pipe. Pro‐Flex® flexible pipes will stay in place when formed or bent. Non‐annealed pipe, bent after forming, has a much higher chance of stress corrosion cracking.
  • Pro‐Flex® CSST is sold along with an installation manual which includes all information needed to install Pro‐Flex® correctly.  Unlike other CSST systems, one is not required to become certified to install this product. By reading and understanding the installation manual and signing and mailing the qualified installer card back to Pro‐Flex®, the installer is then qualified to use this product.

Q: Where can I purchase Pro‐Flex®?

A: There are a variety of options. Please see the tab PLACES TO BUY PRO-FLEX CSST on this web page.

Q: Why should I use Pro‐Flex® rather than conventional‐steel (black and/or galvanized) pipe?

A: Pro‐Flex® saves up to 75% of the installation time required for a conventional steel black iron or galvanized pipe system. Less time on‐the‐job means more production time for the installers. Pro‐Flex® is extremely light weight and transportation to the job site is easy. The potential of leak points is highly reduced because there are fewer joints/fittings per run. No pipe‐threading machine – CSST can be cut with standard tube cutters. Faster is better!

Q: What is Pro‐Flex®?

A: Pro‐Flex® is Corrugated Stainless Steel Tubing (CSST). Pro‐Flex® CSST offers a flexible alternative to black pipe installations. With today’s modern technology, flexible piping systems such as Pro‐Flex® provide a time- and cost-saving way to offer your customers’ clean‐burning, reliable gas appliances in their homes. Pro-Flex CSST is ideal for adding gas service in a new construction, expansive multi‐family developments, home renovations and gas appliance additions to homes small, large, or historic.


Air-Flex Pipe® Kits

Air Flex is easy to install and provides efficient transportation of air supply to the work station or another needed destination in your work shop, auto shop or light industrial work setting. The Air-Flex Pipe System replaces rigid black iron pipe systems. Saves energy since corrugated stainless steel resists contamination, corrosion and inline leaks in the hose. Pipe can be bent by hand, making installation quick and easy. No special tools are required.

Air-Flex Pipe® Applications

  • Light Industrial
  • Auto Repair Shops
  • Tire & Muffler Shops
  • Home Work Shops
  • Hobby Shops

Air-Flex Pipe Features:

  • 304 Stainless Steel, flexible enough to bend by hand
  • Brass Fittings, can be assembled without special tools
  • Maximum pressure 200 psi
  • Uses regular pipe hangers to hang pipe in place
  • Light weight – ½” x 25 ft. kit is approximately 10 lbs.

Air-Flex Pipe® Benefits

  • Designed to carry the air supply back to the work stations (replaces rigid black pipe systems)
  • Quick, clean, and easy to install
  • Eliminates extra fittings that can vibrate loose
  • Air-Flex Pipe has only two fittings hence reducing leaks in the system
  • Air-Flex Pipe can be bent by hand – no special tools required
  • Energy efficient since corrugated stainless steel resists contamination, corrosion and inline leaks
  • Patented system #5,845,946 / #5,857,716 / #6,102,445

Contact Us

Pro-Flex, LLC

For Pro-Flex CSST Technical Inquiries: (877) 798-6291

For Pro-Flex CSST Sales Inquiries: (765) 798-6137 x 312

All E-mail inquiries:


Corporate Office

Pro-Flex, LLC

501 South State Road 341
Hillsboro, IN 47949
Ph: (765) 798-6137 x 312
Fax: (765)798-6139


Shipping & Receiving

501 South State Road 341
Hillsboro, IN 47949
Ph: (765) 798-6137