High Capacity Whisper Flex Line- 5 sizes available
High Capacity Whisper Flex Line- 5 sizes available
High Capacity Whisper Flex Line- 5 sizes available
High Capacity Whisper Flex Line- 5 sizes available
High Capacity Whisper Flex Line- 5 sizes available
High Capacity Whisper Flex Line- 5 sizes available
High Capacity Whisper Flex Line- 5 sizes available
High Capacity Whisper Flex Line- 5 sizes available
High Capacity Whisper Flex Line- 5 sizes available
High Capacity Whisper Flex Line- 5 sizes available
High Capacity Whisper Flex Line- 5 sizes available
High Capacity Whisper Flex Line- 5 sizes available
High Capacity Whisper Flex Line- 5 sizes available
Please note that some photos are generated for illustration purposes. Actual product colors might be slightly different.
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High Capacity Whisper Flex Line- 5 sizes available

SKU: T300-3132-12

Built to deliver superior performance in indoor and outdoor environments, the High Capacity Whisper Flex Line is engineered from durable stainless steel to meet all your installation needs. Spaced every 2 inches, its staggered pitch design eliminates the common whistling issue during regular installations.

Features & Benefits

  • Heavy-duty stainless steel construction
  • Available in multiple lengths to suit your project
  • Supports high capacity with a 150,000 BTU flow
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  • Description
  • Shipping
  • Specifications
  • FAQs
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The High Capacity Whisper Flex Line is designed for seamless installation and improved gas flow. It features 1/2" female pipe threads on one end and 1/2" male pipe threads on the other. With a 150,000 BTU flow rate—significantly higher than the 90,000 BTU capacity of the 3/8" Whisper Flex Line*—this product is ideal for demanding setups.

Its durable stainless steel construction ensures reliability in indoor and outdoor conditions, while the staggered pitch eliminates the whistling noise often encountered during typical installations. Available in lengths of 12", 18", 24", 30", and 36", this versatile line is perfect for a range of applications.

Specifications:

  • Weight: 4.0 lbs
  • Length options: 12", 18", 24", 30", 36"
  • 1/2" ID, 1/2" female pipe threads on one end, 1/2" male pipe threads on the other
  • 150,000 BTU flow capacity

* ¾ inch flex lines are not manufactured in whistle-free versions because they are unnecessary (will not whistle to begin with). 

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Free shipping on most orders over $129 within 48 Contiguous Unites States. 

  • Order processing time: 1 business day.
  • Estimated delivery: 2-4 weeks from the order date. Times may vary based on product availability.
  • Call us at 1-800-979-3267 to verify shipping lead time.
  • Most products are shipped from our warehouse in Littleton, Colorado.
  • Some custom-finished products and special items will ship from the manufacturer. In these cases additional shipping time is needed.
  • Additional shipping fees apply to Canada, Alaska and Hawaii.

Questions?

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Can this part be used with both natural gas and propane?

Yes, most Colorado Hearth & Home components are compatible with both natural gas and propane. Just ensure your fittings, orifices, and regulator are configured for your specific fuel type. Always confirm the product specifications before installation.

Are these components compatible with Fire Pit Outfitter burners and pans?

Absolutely. Every product in this collection is selected for direct compatibility with Fire Pit Outfitter’s burners, pans, and ignition systems. You can confidently mix and match components for a complete, high-performance setup.

Do I need a professional to install this product?

For safety and compliance, we strongly recommend professional installation by a licensed gas technician or plumber. Gas systems must meet local building codes and be pressure-tested before use.

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SKU T300-3132-12
Manufacturer Colorado Hearth
Weight 4.0 lb

Engineered for Quiet, High-Flow Gas Performance

Upgrade your fire feature installation with a premium gas connection solution designed for large-capacity outdoor systems. The High Capacity Whisper-Flex Line offers more than just a hose—it’s engineered for optimum flow, quiet operation, and professional-grade performance. Whether you're installing a large linear burner, custom fire table, or commercial fire feature, this hose gives you the reliability and ease of installation you need.

High Capacity Whisper Flex Line with brass connectors on a white background

Whisper-Quiet Performance

Traditional flexible gas lines often produce a high-pitch whistling as gas flows at high velocity. This flex line is designed to reduce or eliminate that noise, giving you a clean flame experience without unwanted sound.

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High Capacity Whisper Flex Line on a stone gas fire pit

True High-Capacity Flow

Built for setups with large burners or systems that demand high BTU flow, this line supports greater diameter fittings and minimal flow restriction—so your fire feature performs as intended without bottlenecks.

High Capacity Whisper Flex Line with connectors on a white background

Durable, Outdoor-Rated Construction

Made from stainless steel (or heavy-duty corrugated tubing) and rated for outdoor use, this flex line handles weather, vibration, and the demands of permanent fire-feature installations.

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