Here we have an exciting addition to our range of penis enlarger pumps, the Pressure Gauge Penis Pump features an integral pressure gauge so you can monitor the exact pressure around your penis. Pressure scale is measured in 'hg' units (Approx 2 inHg =1 psi). The clear thick tube has a seal at the base and the finger pump is made from rugged plastic, so will not break easily. The Flexible rubber piping on this quality penis enlarger contains a pressure release valve to disipate the vacuum quickly.