Designed to stop oil from leaking out of the oil cap due to a warped reservoir neck. Makes tightening and removal of the oil cap easier. Installs easily into place. Slight heating of the reservoir neck with a heat gun may be required to install. Fits: Ski Doo REV, REV XM/XU/XS/XP/XR, ZX, CK3, F and S chassis. Arctic Cat Crossfire, M-Series and Sno Pro (not Pro-Cross) chassis. Polaris Edge, IQ, Matryx, RMK, SKS, Switchback, Rush, Indy, Fusion, Evolved, Aggressive and AXYS chassis. Fits most other oil tanks with a 1.75" hole i.d.