The Worksite Pro Hydraulic Quick Coupler for backhoe-loaders uses a single floating hydraulic cylinder to engage attachments. Couplers for 310G, 310SG and 410G fit attachments from Deere, JRB and Caterpillar. Couplers for 710G fit Deere and JRB attachments. There's no need to hold the switch and a function over relief at the same time.