Transform any container into a custom waterer for your furry friend with the RentACoop Auto-Fill Small Animal Metal Cup with Cage Attachment. These metal cups automatically refill with fresh water every time your furbaby takes a drink, ensuring they always have access to clean water. Plus, the cups stop filling when they reach 3/4 full to prevent spills and keep your pal's cage dry. And unlike plastic cups that can easily be chewed on, these metal cups are durable and long-lasting. They are compatible with a variety of containers and watering systems, making them a versatile choice. Simply attach the cup to your container using a 3/8 drill bit, and you're all set. This DIY waterer kit includes two metal drinking cups with attached elbows, washers, wingnuts, cage clips, and instructions.