plastic; Energy efficient: this flue type water heater battery box is designed to maximize energy savings, reducing your overall energy costs; Safety features: it includes builtin safety mechanisms to prevent electrical leakage and overheating, ensuring safe use; Userfriendly installation: the unique design the installation and maintenance process, making it convenient for users; Multifunctional: this battery box supports various functions, catering to different needs and; Durable and reliable: built to last, it offers consistent performance and exceptional durability over time

What's in the box
1 x Fittings