A low-flow emitter (10) includes a rotatable cap (20) and a body (30). The rotatable cap (20) has a threaded hole (25) and a receiving chamber (26) communicating with the 5 threaded hole (25). The wall of the receiving chamber (26) has plural grooves (28), which are annularly arranged in a spaced manner around the threaded hole (25). The body (30) has a shaft (31). The shaft (31) has an external thread (35) and a flexible rib (38) adjacent to the external thread (35) and is connected to the rotatable cap (20) by threaded connection between the external thread (35) and the threaded hole (25) such that the 10 flexible rib (38) is engaged in one of the grooves (28). When the rotatable cap (20) is rotated to adjust the amount of water delivered by the low-flow emitter (10), the area of contact between the grooves (28) of the rotatable cap (20) and the flexible rib (38) of the body (30) stays unchanged, allowing the rotatable cap (20) to produce a consistent feel to the operator. >0
