6 gallon PET carboy for beer or wine. Made of BPA free PET, it will not affect the taste or smell of your product, and will not stain. The PET has a negligible oxygen permeability and so can be used for secondary fermentation. Easy to clean, there are no side-wall ribs to collect yeast or sediment. It is safe to reuse over and over. Usage tips: Use a #10 stopper with PET carboys. For cleaning it is recommended to only use a detergent solution and agitation, do not use a carboy brush as the bristles can scratch the PET.