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