Aquarium Overflow Corner Box 4" x 4"

An aquarium overflow box is an essential tool for aquarium enthusiasts who want to maintain a clean and healthy aquatic environment. It allows water to flow from the display tank to a sump or filtration system without the need for drilling, ensuring effective filtration and stable water levels. Designed for ease of installation, it creates a seamless way to improve water quality, reduce maintenance, and keep your tank looking pristine while supporting the health of your fish and corals.

• 4" x 4" x 3" corner overflow provides approx. up to 430 GPH, 
  suitable for up to 40G aquarium
• 4" x 4" x 4" corner overflow provides approx. up to 520 GPH, 
  suitable for up to 50G aquarium

Optional cover help preventing fish or snails from entering the overflow from the top.

Our overflow boxes are 3D printed using high-quality PETG material that's safe for use in aquariums.