Abstract: Abstract A flow means for cutting off/opening a flow of liquids or gases as well as for routing said flow, of the type that includes a body component that is manufacturable by injection molding and that is formed with a flow passage through it and has at least one sharp edge, circumferential along said flow passage. Wherein the flow means is characterized by that it includes in addition, a flow smoothening means formed as an insert that can be affixed to the flow means body component. The flow smoothening means is formed with a rounded surface that when affixing the flow smoothening means to the body component of the flow means, it integrates with the flow passage and converts the sharp edge into a rounded corner that contributes to smoothing said flow, reducing the tempest like effect of the flow and substantially preventing turbulence and generation of whirlpools.