20Pcs Pump Unidirectional Check Valve Preventing Water Backflow, Essential Aquarium Accessory

Made of high-quality plastic materials, with good durability and stability. It can prevent the water in the fish from flowing back into the pump and is an indispensable accessory of the pump. The installation is simple, safe and , suitable for use in aquarium fish . Condition: 100% Brand New Item Type: Check Valve Material: Plastic Product Color: Blue Suitable for: InletCelsiusoutlet pressure gauge tube 4mm Celsius 0.2in Function: Used as an oxygenation pump due to the pressure difference between the inside and outside when the work stops suddenly, causing the water flowing to reverse, damaging the oxygenation pump and causing the water in the cylinder to overflow to form a property loss. It is an indispensable accessory of the pump to prevent the water in the fish from flowing back into the pump and burning the pump to avoid danger. Product Size: Length: Approx. 3.5cm Celsius 1.4in