The Donaldson P786905 Spiracle™ Crankcase Ventilation Assembly is a high-efficiency filter designed to remove oil mist and soot from engine blow-by gases. Featuring advanced Synteq XP media, this assembly ensures 99.9% efficiency, tested to ISO 17536 standards, which helps protect engine components and reduce harmful emissions. This compact unit measures 104.1 mm in outer diameter and 106.7 mm in length, with both inlet and outlet diameters at 25.4 mm. It is a genuine Donaldson part, known for its reliability and performance in various heavy-duty applications, and is commonly cross-referenced with Cummins 4936636.