Vacuum Gauge Kit (1/4" Connection) Vacuum Gauge: 0 to -0.1 MPa (0 to -760 mmHg), 80mm Diameter Water Evaporation Temperature Scale (with Installation Pointer) Body (with Backpressure Prevention Ball Valve) Mounting Threads: 1/4" Female Flare (Pump Side), 1/4" Male Flare (Port Side) Adapter: 1/4" Female Flare x 5/16" Male Flare