Our Plastic Crock with Locking Ring is available in 2 sizes, 12 oz, and 24 oz. We have your medium, large or extra-large parrot covered. The crock installs easily on virtually any cage. The bowl snaps in so your bird can't remove it and dump the contents. It's made from BPA-free plastic and it's dishwasher safe. Great for both food and water, so purchase 2!