Gauge, Pressure/Vacuum, S.S. Connection and Case, Compound, 0-15 PSI : 30" Hg, 1/4" M NPT, 2" Dia. PTFE stopper is similar to CG-3002-L but with the addition of one female NPT port in the center for connection of compression fittings or pressure/vacuum gauges. PTFE stopper has an extraction nut permitting easy removal of the stopper from the glass outer joint.