Abstract: An equipment adapted to be installed on a working machine, for crushing a structure. A hydraulic piston-cylinder unit is mounted to a bracket member to be mounted to the wording machine, for angular movement relative to the bracket member about an axis of a piston rod of the hydraulic piston-cylinder unit. At least one of a pair of opposed arms has a forward end provided with a crushing member. The pair of arms are operatively connected to the piston rod for pivotal movement, between closed and open positions, toward and away from each other and toward and away from a plane including an axis of the piston rod. A wall of a cylinder of the piston-cylinder unit is formed with passageway supplying hydraulic fluid from a hose unit of the working machine, into the cylinder. A rotatable coupling enables the passageway and the hose unit to communicate with each other, even when the piston-cylinder unit moves angularly about the axis of the piston rod relatively to the bracket member.