The WMF vinegar and oil pourers work with vacuum: there are no oil or vinegar spills. Filling the pourer is easy: simply remove the lid of the glass and then firmly put the lid back on again. The suitable amount of vinegar and oil can be poured simply by tilting the pourer - drizzle it directly at the dining table over the plate or salad bowl. Place your thumb on the upper rim of the opening to stop the stream. This creates a vacuum that withdraws the last drop: there are no drips down the side and the glass containers stay clean. WMF provides vinegar and oil pourers in a selection of designs. Taken apart, all of the parts are dishwasher safe.