This Active Aqua HGRES25C reservoir cover was designed to fit over Active Aqua 25-gallon reservoirs. Made from the same durable, high-impact ABS plastic as the reservoirs, this cover protects the reservoir from contamination and debris. Created with a slightly convex and ribbed design, it fits inside the reservoir top to guarantee that water on it falls back into the reservoir. Contains multi-drill access points to install various meters and pump cords. Protect your hydroponic system reservoir with this Active Aqua HGRES25C reservoir cover today!