Increasing emissions levels has resulted in more precise engineering tolerances in channels and galleries leaving less room between engine components than before, so choosing a genuine Perkins filter is more important than ever to ensure effective cooling and lubrication. Designed to maximize filter efficiency while reducing resistance to oil flow and provide protection to the recommended oil service interval in the Operation and Maintenance Manual. Typically fitted with by-pass valve and anti-drain back valve to ensure the engine oil is in the right place during starting and Compatibility: 850 Series 854 Series: 854E-E34TA, 854F-E34 Toperation. Supplied complete with sealing ring.