Rubber Manifold Boot Fit For 50 SX Pro Senior 50SX LC Superior Sealing Enhanced Engine Reliability Fit For 50 SX Pro Senior For cooled 50SX LC mini For dirt bike assembly elasticity rubber construction , vibration operating temperature Forms airtight seal to vacuum leaks unstable air-fuel mixture ratio flange layout cylinder carburetor mounting surface Direct replacement for cracked, hardened or leaking manifold boot