The most recent significant product upgrade from Shaver is the "master cylinder" post driver. The master cylinder allows for quick and easy hook up, eliminating the need for routing a return hose through the hydraulic system. All hydraulics are powered through the auxiliary ports, allowing for quick hook up and removal of the post driver.
Note: this driver can also be mounted to a tractor, which eliminates the need for a return adapter to the tractor hydraulic system. One pair of tractor remote couplers would be required.