DuraVent | Pipe 25' Flex Length DuraFlex 304 Stainless Steel Tee Kit

Save $73.93
DuraVentSKU: 3DF304-25KT

Regular price$665.28 Sale price$739.21
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Size: 3"
⛟ Estimated Delivery Date: Between and to all states excl. Alaska & Hawaii.


Crafted for installations with minimal offsets in the chimney, our DuraFlex 304 and 316 liners are the pinnacle of versatility. Whether you're dealing with wood-burning, non-condensing gas, or oil-fired appliances, these liners excel. For environments demanding heightened corrosion resistance, especially in coal-fired setups, we recommend the DuraFlex 316. Rest easy knowing that DuraFlex 304SS and 316SS liners meet the stringent UL 1777 and ULC S635 standards, ensuring your safety is paramount.

At DuraVent, we understand that one size does not fit all. That's why we offer the flexibility to customize the length of your venting system. With a minimum order requirement of just 10 feet, you can tailor your DuraFlex Pro and DuraFlex SW liners to your specific needs. Need larger diameters? No problem. Opt for 9"-12" diameters when ordering custom lengths, and complement your setup with Ventinox components for all 9"-12" flex systems.

Key Benefits

  • Exceptional durability for long-lasting venting solutions.
  • Versatility to accommodate various appliances and setups.
  • High corrosion resistance, ideal for demanding environments.
  • Customizable lengths and diameters to suit your unique needs.
  • Compliant with UL 1777 and ULC S635 safety standards.

Key Features

  1. Kit flex lengths available in 15’, 20’, 25’, 30’, and 35’.
  2. Comprehensive kit includes DuraFlex SS Top Plate with Welded Storm Collar, DuraFlex SS Removable Vertical Cap, DuraFlex SS Tee with Cap, and DuraFlex 304 length.
  3. DuraFlex SS Top Plate seals the top of masonry chimneys and securely supports flex with a fast connect band.
  4. DuraFlex SS Removable Vertical Cap is designed for easy termination of your relining system and attaches effortlessly to the storm collar with a fast connect band.
  5. DuraFlex SS Tee With Cap ensures a secure connection to DuraFlex SS length via a fast connect band.
  6. DuraFlex SS 304 Length is compatible with wood-pellet, non-condensing gas, wood-burning, and oil appliances.


The DuraFlex 304 flexible relining system is the go-to choice for masonry chimneys in various applications, including fireplace inserts, furnaces, boilers, and water heaters. Its versatility extends to gas, wood pellet, oil, and wood appliances, making it the ultimate solution for all your venting needs.


Model Size Flex Length
3DF304-25KT 3" I.D 25 ft.
4DF304-25KT 4" I.D 25 ft.
5DF304-25KT 5" I.D 25 ft.
55DF304-25KT 5.5" I.D 25 ft.
6DF304-25KT 6" I.D 25 ft.
7DF304-25KT 7" I.D 25 ft.
8DF304-25KT 8" I.D 25 ft.
Materials 304 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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