Donaldson P778905 Air Filter The Donaldson P778905 is a Primary RadialSeal™ Air Filter designed for heavy-duty diesel engines in construction, mining, agriculture, and forestry equipment. Its robust construction and advanced filtration media ensure optimal engine protection and longevity. 📐 Key Specifications Part Number: P778905 Filter Type: Primary Air Filter Seal Type: RadialSeal™ Media Type: High-efficiency cellulose Outer Diameter: 237 mm (9.33 inches) Inner Diameter: 131 mm (5.16 inches) Length: 461 mm (18.15 inches) Efficiency: 99.9% (ISO 5011 standard) ⚙️ Features & Benefits RadialSeal™ Technology: Ensures a secure, leak-resistant seal, even under heavy vibration. High-Efficiency Cellulose Media: Provides superior filtration across various heavy-duty engine applications. Corrosion-Resistant Steel Liners: Support the media during operation and help maximize airflow. Pleatloc™ Feature: Ensures uniform pleat spacing and prevents media bunching, promoting longer service life