Insulated exhaust roof and wall thimbles are triple wall all stainless steel type 304 construction. In most applications choose silencer size with inlet connection at least one size larger than size of engine manifold exhaust connection never reduce or restrict silencer or piping size. Apply a bead of hi temperature rated sealant mil a 46106b 100 series rtv around the perimeter of the exterior flashing that will be in contact with the roof wall and is a minimum of. 
				
			
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