Why won't my duravent 6 in black pipe fit into the 6 in wall thimble? : r/Fireplaces

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This pipe wall thimble manufactured by DuraTech makes passing chimney piping through your room wall a cinch! This particular model of all-fuel chimney pipe wall thimble is compatible for use with six-inch pipes and can be used with both four and ten-inch walls.

DuraTech Wall Thimble

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DuraTech Chimney Pipe - Wall Thimble Installation