DuraVent | Flex Pipe DuraFlex 20' Pro Stainless Steel Tee Kit

Save $74.58
DuraVentSKU: 3DFPRO-20KT

Regular price$671.26 Sale price$745.84
Black Friday Sale is ON! Free Shipping & Returns on All Orders. Get 15% off with the Code: FRIDAY15 for purchase over $99 and 18% off with the Code: FRIDAY18 for purchase over $8000. Best Deal Ever! Need Help? Call 800-466-4712 or mail us at sales@belleflame.com
Size: 3"
⛟ Estimated Delivery Date: Between and to all states excl. Alaska & Hawaii.


DuraFlex Pro Stainless Steel Length represents the pinnacle of flexible steel liners. We've pushed the boundaries, offering 20% more stainless steel per foot than any other liner on the market. This extra strength ensures reliability and durability in even the most demanding installations, especially those requiring multiple offsets. Our commitment to quality is unwavering, as DuraFlex Pro is crafted from highly corrosion-resistant 316 Stainless Steel, making it a trustworthy choice.

Listed to UL 1777 and ULC S635, DuraFlex Pro guarantees your peace of mind. It's not just a product; it's the assurance of safety and performance you can rely on. When it comes to venting solutions, DuraFlex Pro stands head and shoulders above the rest.


  1. Unmatched Flexibility: DuraFlex Pro's extreme flexibility makes complex installations hassle-free.
  2. Premium Stainless Steel: With 20% more stainless steel per foot, durability is never in question.
  3. Wide Diameter Range: Available in 3” through 12” diameters, it suits various applications.
  4. Corrosion-Resistant: Crafted from 316 Stainless Steel for maximum longevity.
  5. Listed to UL Standards: UL 1777 and ULC S635 listings ensure safety.

Key Features

  1. Kit Flex Lengths: Choose from 15’, 20’, 25’, 30’, and 35’ kits to suit your needs.
  2. Comprehensive Kit: Includes DuraFlex SS Top Plate, Removable Vertical Cap, Tee with Cap, and DuraFlex Pro Length.
  3. Top Plate with Storm Collar: Securely seals the top of masonry chimneys while supporting flex.
  4. Removable Vertical Cap: Terminate your relining system with ease.
  5. Versatile Applications: Ideal for wood-pellet, non-condensing gas, wood-burning, and oil appliances.


DuraFlex Pro redefines flexibility for masonry chimney relining. This solution is compatible with gas, wood pellet, oil, or wood appliances, making it a versatile choice for various applications including fireplace inserts, furnaces, boilers, and water heaters. Elevate your venting game with DuraFlex Pro Stainless Steel Length.



Model Size Flex Length
3DFPRO-20KT 3" 20 ft.
4DFPRO-20KT 4" 20 ft.
5DFPRO-20KT 5" 20 ft.
55DFPRO-20KT 5.5" 20 ft.
6DFPRO-20KT 6" 20 ft.
7DFPRO-20KT 7" 20 ft.
8DFPRO-20KT 8" 20 ft.
Materials 316 Stainless Steel
Construction Single-Wall
Clearance 0” clearance for gas, oil, and pellet applications.
Clearance 1” clearance to masonry for wood-burning
Listings Listed to UL 1777 and ULC S635 (MH45609).
Warranty Limited lifetime warranty


About the Manufacturer

Consistently the first to market with new innovations in venting systems, DuraVent has captured a leadership position in emerging markets. DuraVent has patents for several products and continues to design safe and technologically advanced venting.The company’s research into solving problems with corrosion, when biofuels such as corn are used, led to the break-through patent for PelletVent Pro.

Order Confirmation:

Upon placing your order, you will promptly receive an email confirmation. Subsequently, we will conduct a thorough inventory check to ensure all items are in stock and available for immediate shipment. If your order aligns with the advertised delivery timeframe, we will promptly process it for shipment to our warehouse. In cases where the expected delivery time extends beyond the advertised timeframe, we will reach out to you via email and/or phone for confirmation.

Order Shipment:

Within one business day of your item being shipped, you will receive an email confirmation containing a tracking number. If you do not receive tracking information within six business days of placing your order, please don't hesitate to get in touch with us for assistance.

Estimated Time of Arrival:

Our typical delivery timeframe ranges from 2 to 10 business days. Custom-made products generally require 3 to 5 weeks for delivery. If the expected delivery date for your order would fall outside of the advertised 2-10 business day time frame, our customer service team will contact you to ensure your agreement with the revised timeline.

Covered Areas:

Please note that all estimated delivery dates and shipping costs advertised on our website apply exclusively to the Contiguous United States. For inquiries regarding shipping to Hawaii or Alaska, kindly reach out to our customer service team. While we do not offer direct shipping to Canada, we are more than willing to ship your order to the freight carrier of your choice.


It is very important that you inspect the packaging of your items when they arrive and check if you received all boxes listed on the delivery receipt. If you notice any damage or shortage of packages, you must make note of it on the bill of lading, take pictures, and refuse delivery. Your note should say "refused due to damage". You must also take photos of all sides of the box and send them to us within 2 days. If there are no damages visible before opening the box, you must note "subject to further inspection may contain concealed damage". If you notice any damage after receiving the delivery, do not throw the box away, and contact us with the photos. After we receive information from you about the refused delivery or concealed damage, we immediately initiate a claim with the shipping company or with the manufacturer. After the claim is fully processed, we ship all replacements at absolutely no cost to you.

Cancellations & Refunds:

We offer free order cancellations before the shipping label or Bill of Lading is generated, or prior to the commencement of production for custom orders. Please note that custom-made items are not eligible for refunds once production has begun. To be eligible for a return, the item must be unused and in its original condition, with all packaging intact and in perfect condition. Orders delivered outside of the United States are not eligible for refunds. If your order arrives damaged, please refer to the "Damages" section. Our refund policy extends for 30 days. If 30 days have elapsed since your purchase, regrettably, we cannot process a refund. Prior to returning an item, please contact us to discuss shipping details. All refunds will be credited to the original credit card or PayPal account used for the purchase, within two days of receiving the returned items at our warehouse.

Please contact sales@belleflame.com for any questions regarding shipping time.

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We believe that shopping should be easy, convenient, and most importantly, affordable. That's why we work hard to bring you the lowest prices on the products you love. But if you do happen to find a better deal elsewhere, we'll go the extra mile to make sure you get the best deal possible.

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It's that simple! Our 110% best price guarantee ensures that you'll always get the best deal possible when you shop with us. So, why wait? Start shopping now and experience the difference of shopping with Belleflame.

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