Youngs Brew belt A flexible electric heater in the form of a loop to place around your fermentation container to maintain an optimum temperature. made of orange plastic and supplied with a moulded on plug for 230v 50hz AC. To Use. Tighten belt around brewing barrel or vessel. To adjust temperature, raise or lower the belt on your barrel or vessel. • This product is not intended for use by young children or infirm persons without supervision. • Young children should be supervised to ensure that they do not play with the appliance.