Habitrail Ovo Tee for Hamsters All Habitrail Trails can be used together to create a network of passageways for your hamster to discover. The lock connector can also be used with all Habitrail parts and accessories. Directions: add an upward or sideway trail or add a water bottle to your system. All around perforations improve airflow and ventilation to ensure your hamster s home is always fresh.