Why should you only buy your DIY chimney supplies from Chimney Liner Depot? The Factory Direct Difference. Click or Tap here to find out more!

Note: If you are installing the liner in an 8×8 flue make sure you have enough room for the liner. Flex King HD has an Outside Diameter (OD) 3/16 inch more than the Inside diameter. If you insulate that will increase the OD by either 1/2 inch or 1 inch depending on the insulation thickness you choose.

Flex King HD is the ultimate chimney lining solution for venting solid fuel burning appliances.

It’s rugged design will hold up to tricky installations. It’s flexibility and easy to handle weight will make it a breeze to install.

Add to all of this the smooth wall interior and you have the ultimate flexible chimney liner. If you want the best all around solid fuel chimney liner solution than look no further than Flex King HD.

Made in the USA


Flex King HD Stainless Steel Lining Kit. Includes: Cap, Top Plate, SS Liner, Insert Connector, and Installation Instructions. Comes with the EZ Clamp component system for easy installation. This configuration is for wood, coal, pellet, gas, and oil that require an Insert Connector for the bottom terminations. (ie. connecting to a fireplace insert)

flex king is ul tested and listed

flex king is ul tested and listed

Its smooth wall interior allows for more draft and less creosote build-up.

  • Double the thickness of single wall liner
  • Smooth wall on the inside increases draft by 20% and reduces creosote build-up
  • 100% leakproof and air tight
  • All purpose for use on oil, wood and gas
  • Corrugated interlocked seamed on the outside to provide strength and flexibility


Fuel Type: Wood, Pellet, Gas, Oil
UL Listed: Yes – UL 1777