- Diameter measurement is nominal ID - is actual to 1/4" larger. Add about 1-1/2" - 2" for OD size, measurements vary
- Round non-load bearing fired clay
- NOTICE: Due to the fragile nature of clay these require additional packaging so the shipping weight is overstated to cover the cost
- Normally used to connect through the wall to the chimney connector thereby providing a non-combustible surface in the wall
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