The Mastercool 57461 3-Valve 3/8" Ball Valve Manifold Vacuum Set features an exclusive ball valve design in which the ball valve rotates 90 degrees between two Teflon washers and requires very little effort to turn-- even under pressure. The ball valves open and close very quickly with only a slight quarter turn required. The full 3/8 inch bore all the way throughout the block increases flow rates faster than standard block designs.

The visual knob position quickly indicates to the user if valves are open or closed. The color-coordinated gauges allow for multi-refrigerant recognition.