4" Drainage Tee www.starnursery.com - $3.69 RattyRat's Review: This white plastic piping is another kind of drainage pipe that you can get. It's more expensive, but more durable than the black tubing/piping. These pipes make great tunnels for your rats and they are easy to clean. You can even buy straight pipes to attach to the connectors on this tee pipe and make a fun maze. These pipes are easy to find at your local home improvement store.