The Rectangular Seal is designed to help distribute the sealing force evenly across the mating surfaces of the After Treatment Ambient Assisted Cooling manifold and aftercooler. When the ATAAC manifold and aftercooler are assembled, the rectangular seal is compressed between the two mating surfaces. withstand high pressure and temperatures and Withstands exposure to oils, fuels, and other fluids that may be present in the exhaust unit.Attributes:• Fire retardant, hot and bubble specification for closed and open cell sponge.• Mating surfaces of the ATAAC manifold and after cooler must be clean and free of debris or damage.• Provided with 14 mounting holes to fit a fastener of size 5/16.Applications:The rectangular seal is used to provide a fluid-tight seal between the After Treatment Ambient Assisted Cooling manifold and an aftercooler.