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4" x 35' Stainless Steel Liner Kit (includes cap, flashing, adapter, hardware, 3-4 increaser and tee) - W405KB
Heatfab$549.494" x 35' Stainless Steel Flex Liner Kit (includes cap, flashing, adapter, hardware, tee, 3 - 4" increaser). Genuine OEM Part -
4" x 25' Stainless Steel Flex Liner Kit (includes cap, flashing, adapter, hardware) - Flex 405KA
National Chimney$437.774" x 25' Stainless Steel Flex Liner Kit (includes cap, flashing, adapter, hardware) - Flex 405KA. There is no reducer in this kit.