Abstract: A plug for a stopcock as well as a stopcock and a method for manufacturing a plug, by means of which the aforementioned problems are solved. This is achieved by the fact that the plug, consisting of a cone part and a handle part, is formed in one piece. This plug can be rotatably mounted in an interior of a stopcock housing and has the cone part, which has a conical surface, and the handle part, which has a handle, lying one behind the other in the direction of an axis of rotation. The conical part also has a bore perpendicular to the axis of rotation, which can be designed as a fluid channel, whereby the conical surface can be brought into a sealing connection with an inner surface of the interior of the housing. The cone part is manufactured together with the handle part from a single workpiece by means of a turning and milling process.