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Chimney, Pipes & Liners > Lining Systems > Ventinox VG AL29-4C Stainless Steel Liner > Couplers - AL29-4C Products - Couplers - AL29-4C 3" Coupler AL29-4C By Protech Other Sizes: -- Choose a size -- 3" Coupler AL29-4C 4" Coupler AL29-4C 5" Coupler AL29-4C 6" Coupler AL29-4C 7" Coupler AL29-4C 8" Coupler AL29-4C 9" Coupler AL29-4C 10" Coupler AL29-4C 11" Coupler AL29-4C 12" Coupler AL29-4C