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Chimney, Pipes & Liners > Lining Systems > Ventinox VFT 316Ti Stainless Steel Liner > Couplers - 316Ti Products - Couplers - 316Ti 3" Ventinox Coupler 316Ti By Protech Other Sizes: -- Choose a size -- 3" Ventinox Coupler 316Ti 4" Ventinox Coupler 316Ti 5" Coupler Ventinox 316TI 5.5" Coupler 6" Coupler Ventinox 316TI 7" Coupler Ventinox 316TI 8" Coupler Ventinox 316TI 9" Ventinox Coupler 316Ti 10" Ventinox Coupler 316Ti 11" VFT Coupler 12" Ventinox Coupler VFT 7" Oval Coupler By Protech Other Sizes: -- Choose a size -- 7" Oval Coupler 9" Oval Coupler 10" Oval Coupler 8" Oval Coupler