Stanley BR87 Class Hydraulic Breakers are heavy-duty tools for work in the 90 pound class and above (8"+ Concrete). They are highly productive in utility construction, street maintenance, repair of water and gas mains, and general contracting jobs. A feathering On/Off Valve controls speed, making start-up and initial tool placement easy. Diaphragm Accumulator provides trouble-free operation. Operate at a 2000 psi input pressure, 8 gpm outflow with a maximum back pressure of 250 psi (17 bar) on open-center systems.