Winnerwell Stainless Steel Spark Arrestor A replacement of cowl. The sparkarrestor attaches to the top section of flue on Winnerwell stoves. The mesh with diameter of 10mm to prevent sparks flying out from the pipes to fire leaves or tents around It even has 3 eyelets at the bottom to assure that you can fasten guy ropes and keep it stable in high winds. It has a 63mm diameter, same diameter as Winnerwell stove pipes so that they can match perfectly.