EZ Crock 20 oz Fantastic clip on crock for your pet. The clip locks it in place so your bunny won't spill it! The EZ crock is a great clip on crock for your pet. Just lift off the clip, slip through the cage wire and slip back on. It locks the crock in place. No more spilling or tipping the water or feed out! Made of a sturdy, safe ABS plastic. EZ crocks are available in three sizes: 5 ounce, 10 ounce or 20 ounce.