... ; 3. swift from a excavator to a rock/concrete breaker Bolev Hydraulics:Bolev welcomes your visit!HRS-03 2 way ... is used for convert a excavator into a rock/concrete breaker. it works as:3 ports, P port in, A ... P port to T port, direct to return line, breaker does not work;Position 2, P port to A port ... , breaker valve starts to work;easy assembly;working pressure: 1). ...