What is the location of the plumbing chamber door on a school bus or mass transit vehicle?

The plumbing chamber door on a school bus or mass transit vehicle is typically located in the sidewall of the vehicle. This placement is designed for easy access for maintenance and repair of the plumbing systems without requiring extensive disassembly of the vehicle's interior. By situating the door in the sidewall, service personnel can efficiently perform necessary checks and repairs while minimizing disruption to passengers and the operational functionality of the vehicle. This design feature enhances safety and convenience in managing the vehicle's plumbing systems.