This air filter housing encloses the primary filter element and directs incoming air to the intake system of the host tractor. It forms the sealed chamber that connects the pre-cleaner or intake duct to the filter element, ensuring all combustion air passes through the filtration media. The housing is supplied without the cap; the cap must be ordered separately. This version is distinguished by its internal diameter, which matches the corresponding filter element and cover assembly. A housing with a different internal diameter will not seal correctly with the intended filter cover, allowing unfiltered air to bypass the element and enter the engine. On reinstallation, ensure the sealing surfaces are clean and the retaining clips or bolts are secured evenly to maintain the air-tight seal.