Selkirk 4" to 8" Flex Adapter (Saf-T Liner)

Size: 4" to 4.25" Flex Adapter (304L)

Estimated Arrival: Between and . (To All Contiguous States)

✔ Same-Day Order Processing
✔ Free Returns
✔ No Restocking Fees
✔ Financing Options Available

Text or call 888-992-1556, start live chat, or email with any questions. Our team is available to serve you 8:00 AM - 11:59 PM ET, 7 days a week.

Selkirk 4" to 8" Flex Adapter (Saf-T Liner 304L/316L SS)

In the last 20 years, thousands of Saf-T Liner systems have been installed. Each system is built to last. We offer a lifetime guarantee because we manufacture products that are simple to install and perform reliably year after year.

The Saf-T Liner system is designed to be so easy to install, one professional on the job can do it alone - and have time to do another installation the same day. Saf-T Liner and Saf-T Wrap are designed to make installation as trouble-free as possible. The 304L system is best suited for wood burning applications, whereas type 316L system is equally suited for wood, coal, or oil-fired installations.

  • 304L Stainless Steel for gas or solid fuel
  • 316L Stainless Steel for fossil fuels including coal and oil
  • Easy to install on fireplaces, inserts and appliances
  • Continuous-seam welding with tapered male and female ends for ease of installation
  • Saf-T Wrap is a ceramic-fiber insulation with a reflective aluminum coating and snap-lock closure to speed installation
  • Venting Top Kit can bring a noncompliant masonry chimney to code
  • Custom sizes available upon request
  • Smart Choice warranty on all components


  • Listed to UL 1777 (Saf-T Liner installed with Saf-T Wrap)

Product Code
4454SS 4" to 4.25" Flex Adapter (304L)
4555SS 5" to 5.25" Flex Adapter (304L)
3555AR 5" to 5.25" Flex Adapter (316L)
4656SS 6" to 6.25" Flex Adapter (304L)
3656AR 6" to 6.25" Flex Adapter (316L)
4757SS 7" to 7.25" Flex Adapter (304L)
3757AR 7" to 7.25" Flex Adapter (316L)
4858SS 8" to 8.25" Flex Adapter (304L)
3858AR 8" to 8.25" Flex Adapter (316L)

CA Residents: See Prop 65 WARNING.


Lifetime Limited Warranty

Refer to the Smart Choice Warranty for full warranty details.