Reshape the top opening of your oil reservoir back to a perfect sealing surfaceNo more oily residue on the pull rope, exhaust, clutches or brakesMakes removing and installing the oil cap easierWide top lip for large sealing surface; tapered bore for added strengthComplete with rubber O-ring for added sealingWill fit any reservoir with a 1.75" openingNOTE: Will NOT fit oil cap/reservoirs of Arctic Cat Procross, Firecat, Twin Spar, Z, ZL, or ZR. Will NOT fit oil cap/reservoir of any Polaris with a reservoir opening smaller than 1.75".