In sample gas conditioning systems which cannot be pressurised, condensate accumulating in the sample gas coolers must be removed with peristaltic pumps or collected in condensate traps. The GL 1 and GL 2 receptacles have a drain valve and only differ in size. The GL 3 receptacle has a level switch for displaying the fill level or controlling a pump. The drain is a glass thread version into which a drain valve can optionally be installed. All condensate traps are made from Duran glass and PTFE, making them corrosion-resistant.