Abstract: A decompression block assembly for coupling a source of hydraulic pressure to a hydraulically operated attachment. The assembly includes a valve body defining first and second ports that are fluidly connected to first and second couplers that are connectable to hoses of the attachment. The valve body includes a shuttle chamber having an opposed valve seats and a valve element engageable with the valve seats depending on residual pressure in fluid passages. A release member is operable to connect the shuttle valve to a drain port to discharge residual pressure in one or both fluid passages communicating with the attachment. The release member, when operated, opens a check valve in order to discharge residual pressure.