Expansion Chamber Seal kit for 2-Stroke 200 250 300 cc Euro Dirtbikes KTM SX, GasGas EC EX MC, & Husqvarna TC TE TX Motorcycles. Kit replaces old factory parts with fresh springs, o-ring seals, and pipe to silencer coupler. Kit configured to re-seal stock or aftermarket pipe with proper new swivel hook pipe springs, "O" Rings, and Hi-temp silencer to pipe coupler. Replaces factory equipment with exact fit quality parts. Kit comes complete with what you see. Designed to fit KTM 2-Stroke 200cc &';11+, 250/300cc &';99+, Husqvarna TC/TE 250 &';14+, & TE/TX300 &';14+, and GASGAS EC/EX/MC250/300 &';21+ Complete set, nothing else needed to seal up your two stroke exhaust pipe.