he CAMCO 26-inch Aluminum Water Heater Drain Pan (Model 20816) is designed to protect your floors from potential water damage caused by leaks from gas or electric water heaters. Constructed from durable aluminum, this pan resists rust and corrosion, ensuring long-lasting performance. It features a pre-cut side opening for easy installation of the included 1-1/2 inch CPVC drain fitting. The pan's interior diameter is 26 inches, with an exterior diameter of 27 inches, and it has a depth of approximately 2.5 inches. For optimal fit, it's recommended that the pan's interior diameter be at least 2 inches larger than your water heater's diameter.