Directly installed in the oil fills to cool engine and prolong the service life of it.Fitment: for Yamaha Jog,RSZ GY6 50 125cc150 200cc. Pipe connector and hose included. Fit most scooters, atv, go karts with GY6 base engines, but can be used in all applications except that fitting may vary.Relieves pressure from crankcase. Good if you have a big bore kit installed. or high rpm cvt transmission modifications. variator, springs.