{HEAD ~ The fixture} is constructed with {TAIL ~ surfaces} that allow the fixture and water to form a seal around each device 
is constructed with
{ HEAD ~ The fixture } is constructed with { TAIL ~ surfaces } that allow the fixture and water to form a seal around each device
HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH