Copperfield Chimney 6" x 13" x 17" 316Ti Alloy Stainless Steel Light Flex Hybrid Deluxe Top Flat Top Plate d18.625 The flex form install collar Size:30" Beach Pebble Lite Stone Ball Set The flex form install collar merges the gap between the fire pit structure and the insert pan for easy installation and auto centering featured with a curved lip Manufacturer* Brand Type Diameter American Metal HSS AC Triple Wall 8" (20 cm) American Metal HS AC Triple Wall 8" (20 cm) ICC Excel 2100 1" Solid Pack 8" (20 cm) M&G DuraVent DuraTech 1" Solid Pack 8" (20 cm) M&G DuraVent DuraTech Canada (DTC) 1" Solid Pack 8" (20 cm) M&G DuraVent DuraPlus HTC 2" Solid Pack 8" (20 cm) M&G DuraVent DuraPlus AC Triple Wall 8" (20 cm) Metal Fab Temp Guard 1" Solid Pack 8" (20 cm) Olympia Chimney Ventis 1" Solid Pack 8" (20 cm) SBI Venting Division Nexvent 1" Solid Pack 8" (20 cm) Security Chimney S 2100 + 2" Solid Pack 8" (20 cm) Selkirk CF Sentinel (CF) 2" Solid Pack 8" (20 cm) Selkirk Super Pro 2100 (ALT) 2" Solid Pack 8" (20 cm) Selkirk Super Vent 2100 (JM) 2" Solid Pack 8" (20 cm) *Specific components may be required depending on the chimney manufacturer Flat design makes it flush with your roof and Smooth N Lite Liners