Cream separators are expensive pieces of kitchen equipment that you can use to separate the cream from the rest of a gallon of milk. Cream lovers, however, can just as easily make their own cream separator by reusing an old spigot jar. Since the cream will separate by itself, there is no need to spend money on expensive equipment.
Fill a spigot jar with a gallon of nonhomogenized milk. The homogenisation process permanently integrates the cream into the milk, so it will not separate in any cream separator. Most stores don't carry nonhomogenized milk, so check with a local diary.
Sit the spigot jar in the refrigerator for 24 hours. Do not shake or move the jar. In that time, the cream will rise to the top and a visible line will develop that separates the cream from the milk.
Put a milk jug under the spigot and open the spigot of the jar. Drain the milk into the milk jug until you reach the cream line. Close the spigot.
Put a bowl under the spigot and open the spigot to drain the cream into a separate bowl. You will now have skimmed milk in the milk jar and cream in the bowl.