OQ 70/55 suitable for machines from 18-28 tons. OQ 70/55 is a fully automatic quick coupler system to suit all medium sized excavators from 18 to 28 t and allow for quick tool changes between mechanical and hydraulic attachments. The coupler is sturdy, backlash-free and can withstand tough treatment. OQ 70/55 provides the ability to use tools that require two separate hydraulic and leakage management. Optional electrical connector.