What is the purpose of a thumper in moonshine making?

A thumper, or thump keg, is used in moonshine making to enhance the distillation process. It acts as a secondary chamber where the vapor from the primary still passes through, allowing it to interact with additional wash or low wines. This interaction helps to increase the purity and flavor of the final product by condensing some of the unwanted compounds and allowing for a more refined distillation. Essentially, it improves the efficiency and quality of the spirits produced.