The Cat 3391048 Breather Filter is an essential component designed to remove contaminants from the air entering the crankcase or other enclosed systems in Caterpillar industrial engines and heavy machinery. This genuine OEM filter helps prevent premature wear, extends engine life, and maintains optimal system performance by ensuring only clean, filtered air is circulated. It features a height of 114.3 mm, an outer diameter of 76.2 mm, and an inner diameter of 44.45 mm, with a weight of 0.18 kg.