Abstract: A diffuser for finely dividing a liquid, particularly water to be degassed, in which at least two annular plates pairwise engage one another by rims located near the outer circumference and are held spaced apart at the inner circumference by spacers having a radial passage, the space inside the plates of each pair having a connection for the supply of the pressurized liquid to be diffused, at least one of each pair of relatively co-operating plates being resilient and means being provided for clamping the plates together against spring force.