Designed to fit on the round chimney pipe just above the roof flashing The upper edge of the storm collar should be waterproofed with plastic sealer to prevent any water from leaking between the storm collar and chimney pipe Part is tightened with screws or tabs after proper positioning Stainless Designed to fit on the round chimney pipe just above the roof flashing The upper edge of the storm collar should be waterproofed with plastic sealer to prevent any water from leaking between the storm collar and chimney pipe Part is tightened with screws or tabs after proper positioning Stainless 6-Inch