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