Abstract: A compressed air distribution system to control the movement of a reciprocating concrete breaking jackhammer wherein a plastic distributor made of two individual pieces is provided with a seat on each piece for a pellet moving therebetween is disclosed. The efficiency of the distributor is significantly increased as a result of the reduction of shock loading on the seats as well as the virtual elimination of vibration as a result of rebounding of the pellet. These improvements significantly increase machine performance and lowers the manufacturing cost.