KLX250S '06 - '20 KLX300 '21 - '26 KLX300R '20 - '26 KLX300SM '21 - '26 This gasket seals the joint between the head pipe and muffler. These gaskets are easily damaged when removing the original muffler. Get a fresh one now to ease installation of your new performance muffler. Ships same business day $15.95