Plunger for plumbing fixtures

A plunger for a low volume toilet defining a true arch shaped drain depression in a bottom of the toilet bowl, the drain depression defining a siphon jet and a separate waste exit port spaced apart from the siphon jet, the plunger comprising:

• a resiliently deformable body having a convexly dome shaped closed top portion carrying a handle attachment, and a truncated conic shaped lower portion defining an open bottom orifice opposite the handle attachment, and wherein the closed top portion, the truncated conic lower portion, and the bottom orifice all have a peripheral configuration of a true arch, and each true arch has an arc at one end portion and a leg extending linearly from each opposing end of the arc to a linear base portion spaced apart from and opposite the arc;
• the top portion of the body and the lower portion of the body are interconnected to one another along adjacent edge portions to define an interior cavity communicating with the open bottom orifice;
• the closed top portion defines a first cavity having a first volume;
• the lower portion of the body defines a second cavity having a second volume, and the second volume is less than the first volume;
• the open bottom orifice is circumscribed by a resiliently deformable exterior lip and angulated sidewalls extend upwardly and laterally outwardly from the resiliently deformable exterior lip to interconnect with a bottom edge of the closed top portion wherein the first cavity and the second cavity communicate to form the interior cavity;
• axial downward pressure exerted on the closed top portion by use of a handle interconnected to the handle attachment causes the closed top portion to forcibly collapse downwardly into the second cavity which responsively forcibly and directionally expels contents of the interior cavity through the open bottom orifice;
• and
• and wherein the true arch configuration of the resiliently deformable body sealingly engages within the true arch shaped drain depression in the toilet bowl bottom and wherein the angulated sidewalls that extend upwardly and laterally outwardly from the resiliently deformable hp to interconnect with the bottom edge of the closed top portion obstruct and seal off the siphon port while positioning the open bottom orifice to sealingly engage with the waste exit port so that the expelled contents of the interior cavity is directed solely into the waste exit port.