A cycling valve , reversing valve and actuator mechanism provide {TAIL ~ operator control} of {HEAD ~ the devices} contained in housing  
A cycling valve , reversing valve and actuator mechanism provide { TAIL ~ operator control } of { HEAD ~ the devices } contained in housing
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH