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Chimney, Pipes & Liners > Lining Systems > Heat Fab Stainless Steel Saf-T-Liner > Adapters Products - Adapters 3" to 4" Adapter- 2 Big Ends By Heat Fab Other Sizes: -- Choose a size -- 3" to 4" Adapter- 2 Big Ends 4" to 5" Adapter- 2 Big Ends 5" to 6" Adapter 2 Big Ends 6" to 7" Adapter - 2 Big Ends 6" to 8" Adapter -2 Big Ends 7" to 8" Adapter - 2 Big Ends