DCAP-PV Pressure / Vacuum Hand Pump

https://www.youtube.com/watch?v=EcylZiJo98o&feature=youtu.be
A versatile, easy-to-use pressure pump that allows you to quickly switch to vacuum testing with just a turn of a knob, the Ralston DCAP-PV Pressure / Vacuum Hand Pump is ideal for calibrating DP pressure transmitters, testing pressure switches or checking pressure gauges in the field.