Our G-300 Pressure Brake Bleeder is an OEM-recommended product. It's a diaphragm-type bleeder that keeps fluid and air separated. It has a large 4-gallon reservoir that eliminates frequent refilling, and it requires only one operator for both conventional and anti-lock brake systems. The G-300 comes with a quick coupler, and it has wheels for mobility. The G-300A is available, which includes no adapters.