Air oil separator is designed specifically for vehicles with positive crankcase ventilation systems. Prevents oil blow-by from being displaced into the intake tract on engines where crankcase pressure is high such as (but not limited to) power adder or high RPM applications. Features a clear polycarbonate bowl for durability and easy viewing, serviceable 5 micron element and a twist/turn drain. Easily cleaned with household soap (dishwashing liquid), thoroughly rinse and air dry (do not use compressed air). Includes mounting bracket and two 1/4"NPT x 3/8" hose barb fittings. Always route away from heat sources. Maximum pressure of 150psi.