Miniature Vacuum Ball Valves Model #: BVC-18-MF Vacuum ValvesMiniature Ball Valves Model No.: BVC-18-MF AMale Thread BFemale Thread Orifice in. (mm) Cin. (mm) Din. (mm) Ein. (mm) Fin. (mm) 1/8″ NPT 1/8″ NPT 0.217 (5.5) 1.45 (37.0) 0.354 (9.0) 0.75 (19.0) 0.83 (21.0)