Square Support Extension | Secure Temp ASHT570438948SKU:SECPSSelect Item:Price: $82.40Quantity: ASHT Wood Stove Chimney SQUARE SUPPORT EXTENSION This part is designed to extend the finish of the cathedral support when the pitch of the roof is quite steep. It must be attached to the square cathedral support. It fits all diameters of the square cathedral support (SS). Reviews Choose your rating12345