Amazon.com: Ferplast Hamster Cage Play Tube | Replacement Wire Port Connector to Connect Play Tunnel to Hamster Cage, Wire Connector 3.15L x 3.75W with a Tube Diameter of 2.4 - Inches, Replacement
1 Set Plastic Hamster Tube Hamster Cage Maze Connector Hamster Cage External Pipe for DIY - Walmart.com