Abstract: A siphoning group (10) for food waste disposers comprising a main duct (11) which can be connected upstream in a first end 11a with a food waste disposer and downstream in a second end 11b with a discharge tube, at least one derivation duct (12, 12?) connected to the main duct (11) between the upstream and downstream connections for the passage of water from at least another installation to said discharge tube, wherein the siphoning group (10) also comprises means for the selective isolation (13) of the at least one derivation duct (12, 12?) with respect to the main duct (11) during the use of the food waste disposer.