{HEAD ~ The system} also includes a pressure differential switch which senses {TAIL ~ a drop} in pressure across a pedal valve 
{ HEAD ~ The system } also includes a pressure differential switch which senses { TAIL ~ a drop } in pressure across a pedal valve
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH