Water closet

A water closet with gravity flushing including a body portion with an upper level and a lower level, and integral with said body portion, a closet bowl and an outlet conduit forming an odor seal at the bottom of said bowl, said odor seal having an outlet crest determining the highest water level of said odor seal, further a flush water container adjacent to said body portion and means for flushing said closet bowl by said gravity flushing by means of water passing by gravity from said flush water container through said bowl and said outlet conduit, wherein the improvement consists in the combination of the following features to provide for a low flush water consumption:

• (a) that said odor seal outlet crest is at a height level of at least 50 percent of the height of said upper level measured from said lower level;
• (b) that close to said upper level there is an annular flush duct of substantially bottomless configuration free of any constriction to form an open slot opening directly into said bowl at a level above said odor seal outlet crest;
• (c) that said outlet conduit has a constriction at its outlet end at a level clearly below the entire odor seal;
• and,
• (d) that said closet bowl together with said outlet conduit are effectively free of sharp corners within the height level of said odor seal and said constriction is downstream of said odor seal.