Kit comes with custom GM caps (1108) and the universal round (1101) and universal rectangular (1105) caps. Fits general motors 1960 and newer. Uses pressurized brake fluid to force air and old fluid out of your brake lines. Just pour clean fluid into the pressure tank, attach the power bleeder cap to your fluid reservoir and pressurize the system using the built-in hand pump and pressure gauge. The kits are available for a variety of master cylinders.