Pawfly 10 Pieces Check Valve Aquarium Black Valves One Way Non Return Air Pump Accessories for

Aquarium air pump check valve only for oxygen pumps: excellent disposable check valves for most common aquarium air pumps. Do not use them in CO2 or other high pressure systems to avoid cracks or leaks. Aquarium Check Valve Small and Lightweight: Size: 4.2 x 1.27 cm (L x W); Diameter of air holes: 0.3 cm; Weight: 2.1 g. Standard ID airline tube: 4-6 mm. Add little weight to your hose for smooth airflow. Ideal pump protection devices: effectively prevents the backflow of water in the event of a power failure or a break of the pump. Protect your pump in an ideal way and reduce your loss when you are at work or on holiday. STURDY PLASTIC - Reliable plastic that can be firmly connected to the hose without air leaks or restrictions. Always keep your fish alive and endure long-term use. Detachable Design Easily removable for cleaning and maintenance without tools. Please insert something into the hole to open it if it is clogged and restricts airflow.