Use this AlcoEngine Copper Reflux Still Top when you want to craft high - quality spirits like whiskey and gin at home. It's perfect for home distillers and spirit enthusiasts who are looking for an easy - to - use solution. The still top has 13 mm (0.51') barb connections for water inlet and outlet, but it doesn't come with a boiler. You can pair it with a distillation lid and use a BrewZilla or DigiBoil as the base.