Glass Thumper

Primarily for use with a pot still or similar. A thumper (or doubler) acts as a secondary distillation stage within a single run, increasing the final ABV (alcohol by volume) of the spirit and creating a smoother product.

Fill the jar with flavourings such as fruit. As the vapour goes through, it picks up, enhancing the taste.

A glass distilling thumper (or thump keg/doubler) is a secondary vessel, often a mason jar or glass container, placed between a pot still and the condenser to achieve a second distillation, increasing alcohol proof and adding flavour by re-vaporizing alcohol vapours as they pass through a liquid (water or low wines). This creates a noisy bubbling or "thumping" sound as vapours condense, heat the liquid, and re-vaporize, effectively adding another distillation cycle for smoother, higher-proof spirits. 

Glass thumpers are particularly useful for adding botanicals, fruits, or other flavourings to the spirit without the risk of scorching them in the main boiler, as the heat source comes from the incoming vapor, not direct flame.

Made from 15mm copper pipe, they come with 1/2" straight fittings but can be altered to suit.