Copper crush gasket to keep your exhaust leak free. Fits Honda Hobbit PA50II, Camino, Express, Urban Express, Peugeot 103, Motobecane with engines Av7, Av10, Av87, AV88 and others. . As well as the Yamaha QT50. *Does not fit the PA50I with original cylinder*
23mm Inner Diameter and 30mm Outside Diameter.