No special tools. The Pro plus comes in two options. With QD and without. if the Pro Plus has a QD, it needs to be removed. Adjustable wrench and a little care, it comes right off. Pop off the little rubber boot and its it's obvious how the QD comes off. it Be aware that if you switch from a QD to a non QD configuration, you need to make sure there is a high pressure spool in place between the hose and the computer. Not difficult to install, but it needs to be there. Place it in the hose end, then screw the computer on. In a non QD setup, you absolutely need the HP spool. in contrast, in the QD setup, the HP spool cannot be installed or you may damage something.