The MP-V Vacuum Calibration Pump features a Delrin® plastic handle that prevents body heat transfer from interfering with readings, as well as an oversized check valve for smooth operation. The dual o-rings on all pistons ensure zero leakage. It uses a “Shrader” valve which totally eliminates issues caused by vent valve failure. The unique hose and fittings simply Push-on and prevent the hose from tangling. The rugged design means that the MP-V can withstand multiple  drops with little or  no effect.