Toilet comprising a collection body to collect physiological function excretions, defining a longitudinal axis (Z) and having an upper opening delimited by a perimeter edge and a lower opening configured to be connected to a sewer system, said toilet also comprising: - an annular body which delimits the collection body perimetrically and externally at said upper opening of said collection body ; - an annular channel present in said annular body ; - water supply means suitable to lead water in said annular channel to wash the inner surface of said collection body , said annular body comprising an upper ring outside which a seating surface is defined for the person using said toilet and a lower ring perimetrically fastened to the outside of said collection body and spaced from said perimeter edge , said lower ring being suited to define a perimeter band of said collection body which is comprised between said lower ring and said perimeter edge , is housed into said annular channel and is inserted in an annular slot formed between the upper ring and the lower ring , said annular slot being located at said upper opening and facing the inner volume of said collection body , wherein said annular channel comprises a concave area made in said upper ring , characterised in that the concave area is delimited by said lower ring , and said upper ring and said lower ring are removably joined together by connection means to define said annular slot . - an annular body which delimits the collection body perimetrically and externally at said upper opening of said collection body ; - an annular channel present in said annular body ; - water supply means suitable to lead water in said annular channel to wash the inner surface of said collection body , said annular body comprising an upper ring outside which a seating surface is defined for the person using said toilet and a lower ring perimetrically fastened to the outside of said collection body and spaced from said perimeter edge , said lower ring being suited to define a perimeter band of said collection body which is comprised between said lower ring and said perimeter edge , is housed into said annular channel and is inserted in an annular slot formed between the upper ring and the lower ring , said annular slot being located at said upper opening and facing the inner volume of said collection body , wherein said annular channel comprises a concave area made in said upper ring , characterised in that the concave area is delimited by said lower ring , and said upper ring and said lower ring are removably joined together by connection means to define said annular slot . said annular body comprising an upper ring outside which a seating surface is defined for the person using said toilet and a lower ring perimetrically fastened to the outside of said collection body and spaced from said perimeter edge , said lower ring being suited to define a perimeter band of said collection body which is comprised between said lower ring and said perimeter edge , is housed into said annular channel and is inserted in an annular slot formed between the upper ring and the lower ring , said annular slot being located at said upper opening and facing the inner volume of said collection body , wherein said annular channel comprises a concave area made in said upper ring , characterised in that the concave area is delimited by said lower ring , and said upper ring and said lower ring are removably joined together by connection means to define said annular slot . <EOS>