Otto Environmental’s Ports are a great addition to any mouse/rat enclosure. Provides a cozy shelter and is entirely constructed of stainless steel. Available in 4 sizes, or request your own!
OERP12102510: 12″L x 10.25″W x 10″H
OERP643: 6″L x 4″W x 3″H
OERP4542535: 4.5″L x 4.25″W x 3.5″H
OERP332: 3″L x 3″W x 2″H