BMC, air filter element. 4" round

Dimensions: 99mm OD x 61mm ID x 51mm high. Round; 98mm outside diameter x 73mm inside diameter x 51mm deep. Universal for many 4" round & 933807, 933808, 933854, 933853 Rough Crafts air cleaner kits.
'The Red Filter'. As used in Formula 1, Le Mans, Moto GP and World Superbike. Manufactured with a metallic mesh which contains multiple cotton layers of oiled filtration material. This allows improved air flow, sufficient for stock to all-out performance applications. To further help prevent small impurities enter the engine filtration oil is used to create a 'sticky' barrier which allows air flow but helps retains small particles up to 7 micron. All filters are precision made and continuously checked during production for the highest obtainable quality. Filters are washable and reuseable. EU made.