Sue beat me to the punch on the 3rd Generation Vertex FlowControl technology built into each disk.Level is always a good idea but not an operational must.. As far as volts and amps I bench tested the following this am with that same compressor. Static voltage was 242 V Volts on open flow 239 5psi thru 13 psi on this 10 psi pump stayed at 238 volts. Amp draw was 4 at open flow and 4.74 at 5 psi and 5.1 at 7 psi and 5.7 at 10 psi and 6.22 amp at 13 psi.Sue if your running the same tests "STOP"
