a valve housing defining an enclosed hollow space which is substantially circular in cross section, said {HEAD ~ valve housing} including said vertical refill pipe, a transverse inlet pipe receiving water from said supply pipe and a transverse supply line disposed opposite to said inlet pipe at a level higher than said inlet pipe, said supply line being connected to and supplying {TAIL ~ water} to said rim flushing conduit of said toilet bowl; said refill pipe, said inlet pipe and said supply line being communicated with said hollow space 
a valve housing defining an enclosed hollow space which is substantially circular in cross section , said { HEAD ~ valve housing } including said vertical refill pipe , a transverse inlet pipe receiving water from said supply pipe and a transverse supply line disposed opposite to said inlet pipe at a level higher than said inlet pipe , said supply line being connected to and supplying { TAIL ~ water } to said rim flushing conduit of said toilet bowl ; said refill pipe , said inlet pipe and said supply line being communicated with said hollow space
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