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