Now the Official Filter of the Lucas MLRA series. R2C premium breather filters are designed to offer racers the finest crankcase breather technology available today. R2C's flange design improves oil return and significantly reduces the dripping caused by oil collected at the lower flange associated with competitors breather fllters. R2C breather construction also ends the problems associated with cap failures. HD screens eliminate crushed breathers. R2C breathers are fully washable using biodegradable solvents.