A hydraulic connector for a circulator pump , comprising: a hollow pipe body for the flow of a fluid, said hollow pipe body comprising a suction flange portion provided at a first end of said hollow pipe body and structured for connecting to a piping system in a fluid-tight manner, said hollow pipe body further comprising an outlet section provided at a second end of said hollow pipe body , said outlet section being structured for connecting to a volute flange portion of a circulator pump in a fluid-tight manner, said outlet section comprising an outlet hole for the flow of said fluid, said hydraulic connector further comprising a connection element , said connection element being provided at said second end and being structured for providing a releasable coupling between said outlet section and said volute flange portion , said connection element further comprising a coupling flange portion having a coupling surface structured for mating with a respective mating element of a circulator pump main body , said coupling surface being structured for engaging with at least one releasable retaining element , for coupling of said outlet section with said volute flange portion , characterized in that said connection element comprises a circular shaped coupling body on said outlet section , said circular shaped coupling body being structured for engaging with a volute flange portion of a circulator pump main body , said circular shaped coupling body comprising a plurality of, preferably four, peripheral slots for receiving the releasable retaining element , said releasable retaining element being a resilient fixing clip structured for acting on the periphery of said volute flange portion . a hollow pipe body for the flow of a fluid, said hollow pipe body comprising a suction flange portion provided at a first end of said hollow pipe body and structured for connecting to a piping system in a fluid-tight manner, said hollow pipe body further comprising an outlet section provided at a second end of said hollow pipe body , said outlet section being structured for connecting to a volute flange portion of a circulator pump in a fluid-tight manner, said outlet section comprising an outlet hole for the flow of said fluid, said hydraulic connector further comprising a connection element , said connection element being provided at said second end and being structured for providing a releasable coupling between said outlet section and said volute flange portion , said connection element further comprising a coupling flange portion having a coupling surface structured for mating with a respective mating element of a circulator pump main body , said coupling surface being structured for engaging with at least one releasable retaining element , for coupling of said outlet section with said volute flange portion , characterized in that said connection element comprises a circular shaped coupling body on said outlet section , said circular shaped coupling body being structured for engaging with a volute flange portion of a circulator pump main body , said circular shaped coupling body comprising a plurality of, preferably four, peripheral slots for receiving the releasable retaining element , said releasable retaining element being a resilient fixing clip structured for acting on the periphery of said volute flange portion . <EOS>