CHINOOK 150 filter protects electric motors.Applied with a magnet and a normal O-Ring (included).CHINOOK FILTER 150MMSKU: CTCCHIN150$69.42PriceQuantity*Add To CartBuy NowPRODUCT INFOFilter diameter: 5.91 in. Return PolicyAll sales subject to a 25% restock fee. must be unused and in good resaleable condition. Return PolicyAll sales subject to a 25% restock fee. must be unused and in good resaleable condition.