Our premium 18x18 inch High Temp Stove Jacks are manufactured with high-temp siliconized fiberglass, 1000-degree heat-resistant gasket and 1200-degree high-temp thread for durability. Perfect for replacing or outfitting your canvas tent or DIY project, this stove jack offers reliability and peace of mind during all your outdoor adventures. Our stove jacks have slight a oval shape to fit angled roof lines or stove pipes.