Takegawa return type oil filler cap for Monkey Gorilla CRF50 XR50 bikes fitted with oil catch tanks. Breather lines run from your head and crankcase vent to the catch can and return to the crankcase via these handy filler caps. Aluminum construction and available in polished silver or anodized blue. Fits stock Honda clutch covers and Takegawa 3 disc econo clutches.