This continuous siphon overflow box is constructed of acrylic and works without U-tubes. Includes 1” bulkhead and is compatible with standard 1” PVC. Overflow box is ready to use and will save you time and money. We recommend the optional powerhead water pump to prevent losing the siphon due to air pockets that accumulates on occasion.

600 GPH hang-on continuous siphon overflow box for aquarium sumps.