Flushing and pressure-testing device for a connection fitting, in particular for a flush connection fitting, comprising - a lower part which can be releasably fastened to a fitting basic body of the connection fitting, which fitting basic body is connected to a cold water supply and to a warm water supply, which lower part is shaped such that it can be placed on the fitting basic body, - an upper part which can be placed on the lower part, - a sealing element which is arranged on a side of the upper part facing the lower part, wherein the lower part comprises, on a side facing the fitting basic body, a central, preferably hollow cylindrical projection which can be inserted into a central, preferably circular flow channel mouth which is connected to a warm water supply of the fitting basic body, and a number of through-openings (140, 141, 142, 143) which are spaced in the radial direction from the hollow cylindrical projection, wherein a first and a second through-opening (140, 141) are formed in the radial direction equidistantly to a centre point of the hollow cylindrical projection, characterized in that the upper part comprises, on a side facing the lower part, at least one closure means which is designed and arranged in such a way that, in a first flushing position, it can be inserted into the first through-opening and, in a second flushing position rotated through 180° relative to the first flushing position, it can be inserted into the second through-opening, in order to close them in a fluid-tight manner, with the result that, if the device is placed on the fitting basic body, the flows of the cold water flowing into the fitting basic body via a first pipeline connection and of the warm water flowing into the fitting basic body via a second pipeline connection can be directed such that, in the first flushing position, the warm water can flow through a third pipeline connection of the fitting basic body and the cold water can flow through a fourth pipeline connection of the fitting basic body, and in that, in the second flushing position, the warm water can flow through the fourth pipeline connection and the cold water can flow through the third pipeline connection. - a lower part which can be releasably fastened to a fitting basic body of the connection fitting, which fitting basic body is connected to a cold water supply and to a warm water supply, which lower part is shaped such that it can be placed on the fitting basic body, - an upper part which can be placed on the lower part, - a sealing element which is arranged on a side of the upper part facing the lower part, wherein the lower part comprises, on a side facing the fitting basic body, a central, preferably hollow cylindrical projection which can be inserted into a central, preferably circular flow channel mouth which is connected to a warm water supply of the fitting basic body, and a number of through-openings (140, 141, 142, 143) which are spaced in the radial direction from the hollow cylindrical projection, wherein a first and a second through-opening (140, 141) are formed in the radial direction equidistantly to a centre point of the hollow cylindrical projection, characterized in that the upper part comprises, on a side facing the lower part, at least one closure means which is designed and arranged in such a way that, in a first flushing position, it can be inserted into the first through-opening and, in a second flushing position rotated through 180° relative to the first flushing position, it can be inserted into the second through-opening, in order to close them in a fluid-tight manner, with the result that, if the device is placed on the fitting basic body, the flows of the cold water flowing into the fitting basic body via a first pipeline connection and of the warm water flowing into the fitting basic body via a second pipeline connection can be directed such that, in the first flushing position, the warm water can flow through a third pipeline connection of the fitting basic body and the cold water can flow through a fourth pipeline connection of the fitting basic body, and in that, in the second flushing position, the warm water can flow through the fourth pipeline connection and the cold water can flow through the third pipeline connection.