Constructed of open cell foam for prime performance to filter exhaust, reduce exhaust noise, and prevent excessive speed of tool. Used on 10,000 RPM Orbital Sanders. Requirement: Two muffler inserts.
3M(TM) Orbital Sander 20331, 3M(TM) Orbital Sander 20430, 3M(TM) Orbital Sander 20431, 3M(TM) Random Orbital Sander 28334, 3M(TM) Random Orbital Sander 28335, 3M(TM) Random Orbital Sander 28336, 3M(TM) Random Orbital Sander 28337