A liquid-emitting device (1) for gravity-based irrigation systems, comprising a support structure (2) that defines a first longitudinal axis (X-i) and has a nozzle (3) for generating an irrigation jet (J) coaxial with the first axis (X1), a substantially tubular body (5) located below the support structure (2) and a substantially circular baffle plate (6) facing the nozzle (3) and rotatably mounted in the tubular body (5) to rotate about a second longitudinal axis (X2). The first axis (X1) and the nozzle (3) are stationary relative to the support structure (2), the second longitudinal axis (X2) is free to rotate about the first axis (X1) with a precessional motion, guide means are designed to be removably coupled to the tubular body (5) to interact with the baffle plate (6) and prevent the precessional motion about the first axis (X1) while allowing the rotational motion about the second axis (X2). A diverting member (13) is also adapted to be removably positioned downstream from the nozzle (3) to direct the jet (J) over a sector portion (14) of the baffle plate (6) and distribute the liquid over a sector area of the soil. An arrangement of a nutating liquid- emitting device (1) in combination with a anti-nutating adaptation kit (23).
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