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Whistle Free Flex Line Kits

From: $180.00

Whistle Free Flex Line Kits

From: $180.00


  • Single flex line kit – For use with any 240K BTU Burner and  below. Kit Includes: (1) 36” L x 3/4” Diameter Flex Line + (2) 3/4″ Flared Fittings + 3/4” Key Valve +3” and 12” Key + 1/2” x 2” Nipple
  • Dual flex line kit – For use with any burner 250K+ BTU. Kit Includes: (2) 36” L x 3/4” Diameter Flex Lines + (4) 3/4″ Flared Fittings + 3/4” Key Valve + 3” and 12” Key + (2) 3/4” x 3” Nipple + (2) 3/4” Tee + (1) 3/4” x 1/2” MM Reducer Fitting

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The main purpose of a key valve is to enable flame-height adjustment and the ability to easily turn off the gas. The flex line simply connects the key valve to the burner. 

Do you need a key valve/flex line?

  • We recommend it for 85% of all fire feature builds
  • If you’d rather use a gas valve or propane nozzle, you can. Just make sure it’s close enough to your fire feature for safe lighting
  • Even if you have the Premium Electronic ignition, if you want the ability to adjust the flame height, you still need a key valve and flex line kit

Important: When you order a burner package and select YES for flex line/key valve, or you order a complete system from us, we will include the proper sizes and fittings required to connect the key valve to the burner. It will be the best set up for the system that you ordered.


CLICK HERE for Key Valve/Flex Line Sizes

All of the flex lines we provide are whistle free. In order for a large volume of fuel to continue through the key valve on to the burner without any loud whistling, a special line is required. Some standard, yellow flex lines will whistle very loudly when you turn up the fire. 

Keep in mind, there’s a difference between whistling and the sound of mild, rushing wind. No matter what, you’ll probably have the sound of air moving through lines. That’s normal. Sometimes if there is moisture in the line, it can cause a mild whistle or gurgling sound. Over time, it should evaporate. Meanwhile, keep the burner covered when it rains. 

We recommend that you schedule a professional to connect the components. With that in mind, here are some installation tips:

Key Valve Installation

  • Prime the valve before installation. Described in THIS VIDEO
  • You’ll need a hole in your fire feature to install this
  • Our complete systems come pre-drilled
  • The hole should be approx. 1-1/4″ in diameter
  • For paver builds, or any fire feature with a thick wall, consider adding a key valve extension to your order
  • Pro Tip: If hard pipe is not used to connect to the inlet of the key valve, you may notice that it moves when the key is turned. You may need to get creative and assemble a sort of “key valve mounting bracket” to keep the key valve stable.

Flex Line Installation

  • Standard ‘straight’ fittings require pipe dope or tape in order to seal
  • ‘Flared’ fittings do NOT require pipe dope or tape
  • Watch the videos to see where each fitting goes

Don't Miss the Essentials

Finish the top with beautiful fire media, or add accessories such as a cover or ignition. 

Fire MediaAccessories

Need Questions Answered?

We have you covered. Expert advice comes standard.

Matt Hoffman
Matt Hoffman
@google reviews
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There is no comparison between this and what you see at a box store. If you want a real fire and tall flames look no further. If you take your outdoor living space seriously, buy this. No more smoke, no more putting out embers. Montana Fire Pits provides the best customer service you could ask for.
Paxton Gray
Paxton Gray
@google reviews
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Great company with a great product. They shipped fast and were willing to work out the details with me over the phone. I'd highly recommend Montana Fire Pits to anyone looking to build a gas pit.
Tom Tomsen
Tom Tomsen
@google reviews
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"This is an amazing product - you will not find any better fire pit or flame. We love sitting around the fire each night with the sunset. AND the service of Montana Fire Pits is unbelievable!!! Amazing! You will be very satisfied.
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Prices are Changing

Beginning September 1st, 2022

Due to higher labor and shipping costs, complete systems will increase in price by an average of 5-7%. For best prices, we recommend ordering in August. As always, with Montana Fire Pits you’ll enjoy:

  • Products made in the U.S.A
  • Highest quality materials and design
  • High customer satisfaction ratings
  • The best fire in the industry

Thank you for considering Montana Fire Pits!

Lead Times & Shipping


Your Product Ships in:

(transit time not included)

  • Standard Burners: 10-14 Business Days
  • Custom Burners: 3-4 Weeks
  • Venture Series (Steel): 8 Weeks
  • “Ready to Ship” Fire Tables: 1-2 Weeks
  • Gather Series (Concrete): 8-10 Weeks
  • Fire Media: 2-4 Weeks
  • Backordered Fire Media: 3-6 Weeks
  • Ready to Finish Kits: 5-7 Weeks
  • Color Samples: 5-7 Days
  • Fire Pit Parts: 5-7 Days

Shipping Costs

*Free Shipping: Applies to most orders over $99 in the continental U.S. with the following exceptions listed below:

  • Burners/Plates over 36″:  $279.00
  • Electronic Ignition: $479.00
  • Ready to Finish Kits: $279.00

Our burners and fire features are hand-made in the U.S. and good things take time. These lead times are based on our best estimates and are updated weekly. Thank you for your patience as we strive to ship your fire gear as fast as possible.