Water Seal Exhaust Valve Home Brew Beer Wine Tools. FEATURES: This Item Can Emit Carbon Dioxide for Honey, White Wine and Milk Wine Alcohol Fermentation and Can Also Prevent Oxidation. It is Easy to Operate. You Simply Need to Fill Water into the Exhaust Valve, Insert It to the Cover of the Brew Barrel or Rubber Plug on the Top of the Fermentation Container and then Cover It with the Lid. It Can Effectively Prevent Flies from Flying into the Wine/beer with a Cover Included. All of the Fermentation Process is Automatic Fermentation Without Manual Control. And It Can Be Repeatedly Used for a Long Time. It is Suitable for Pure Juice Fermentation Such As White Grapes Fermentation, Honey Wine Fermentation, Red Wine Secondary Ferment. SPECIFICATIONS: Material: Plastic Sub-Type: Airlocks Length: Approx. 17cm / 6.7inch Max Width: Approx. 1cm / 0.4inch Weight: Approx. 12g INCLUDES: 1*Valve . We are an international seller, your order will be shipped from abroad so please allow the necessary time of minimum 14 working days for delivery right now depending on where you ship to, due to ongoing delays in postal deliveries globally.