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