The invention relates to a cock having a housing and a plug which can be rotated therein,the housing and plug made of plastics material, the tap comprising a handle which is non-rotatably connected to the plug for rotating it, and said housing comprising at least two line attachments, characterised in that at least one of said line attachments has Luer-like female end for coupling with a Luer-like male end, said female end having attachment provisions radially extending from said female end and having an outer diameter of 8.2-9.3 mm for receiving a thread-fitting or bayonet-fitting male attachment end.
