Designed to stop oil from leaking out of the oil cap Easy fix for warped oil reservoir necks Easily installs in place Slight heating of the neck may be required for installation, DO NOT use open flame Fits most models included Arctic Cat M-series, Crossfire, and Sno-Pro models Also fits Polaris Pro, Rush, Edge, Evolved, and Aggressive Chassis Will also fit Ski Doo XP, Rev, ZX, CK, F, and S chassis