Plumbing a container home is simpler than most people think. The container itself is just a shell. You run pipes through the floor or walls same as any house. All our units come pre-plumbed for bathroom and kitchen. That means the pipes are already run inside the walls. They terminate at connection points under the floor. Your plumber connects those to your septic system or municipal sewer. The water supply is standard half inch PEX from your well or city water line. Drain lines are three inch ABS. Some counties require a licensed plumber for the connection. Others allow owner install with an inspection. Check with your county. Tankless water heaters are the best choice for containers. They mount on the wall, take almost no space, and provide unlimited hot water. Electric tankless is simpler than propane. Composting toilets are popular for off grid setups. They eliminate the need for a septic system. If you go with a flush toilet you need septic or municipal sewer. Greywater from sinks and shower can go to a separate leach field in many areas. Email info@atvworldwide.com if you want a plumbing schematic for your specific model.