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【Function】 This Aquarium Water Cycle Box equipped With an Overflow Box Guide Rail Protection Comb that Distributes the Water Evenly and Prevents Fish, Aquatic Plants and Other Aquarium Residues From Getting Into the Overflow Box.

【Material】 This Aquarium Water Cycle Box is made of High Quality Acrylic Material, It is Beautiful and Durable, and Has High Light Transmission.

【Protection lid】 The Overflow Box's Water Outlet Tank is Equipped With a Movable Lid, Which Can Effectively Reduce Noise and Prevent Dirt From Entering the Overflow Box.

【Use】 The Overflow Box is Hung on the Outside Edge of the Aquarium and Then Connected to the Filter System At the Bottom of the Aquarium.

【Checking valve】 The Air Outlet Tube is Equipped With a Check Valve that Can Be Pumped Through the Attached Syringe. This Allows the Inside of the Overflow Box to Be Emptied Quickly for the First Time, Making the Overflow Box Easy to Start.