This is a very simple part which allows you to connect your Power Tank hose to a small air tank connected to your compressor.
If you run your air lockers or pneumatic sway bars off of your compressor which has it's own small storage tank, keep this part around as a backup. If your compressor ever takes a dive on the trail, you can recharge the storage tank using CO2 to keep your lockers functioning. The part adapts your hose and plugs into the output coupler of your compressor's storage tank. You can recharge back to 150 psi and maintain the use of your traction equipment until you can get home and figure out what's wrong.
This part fits any industrial style coupler such as ARB's Single Compressor and Twin Compressor.