BDM Dalsin Line Pro-Form 4" x 25ft Aluminum Flex Only zero-clearance High-temperature-rated silicone gasket at each

High-temperature-rated silicone gasket at each female joint

Flame Arrester

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Nested within Bonfire

BDM Dalsin Line Pro-Form 4" x 25ft Aluminum Flex Only zero-clearance High-temperature-rated silicone gasket at each"Dalsin Line" Aluminum Flex Liners are used for venting category 1 heating appliances or direct vent appliances into a masonry chimney. Manufactured using Type 3003 aluminum, this heavy duty 2 ply liner is made from two strips of . 005", high grade aluminum for a total thickness of . 010" What's Included 4" x 25ft Aluminum Flex Only Features Liner is made from 2 ply of . 005 thick type 3003 aluminum strip Components are made from . 020 thick type 3003