6 Pcs Unidirectional Check Valves For Aquarium Air Pump Accessories For Aquarium Black

For Oxygen Pumps Only: Great check valves for most aquarium air pumps. DO NOT use them for CO2 or other high pressure systems to avoid cracks or leaks. Small and lightweight: Size: 4.3 x 1.2 cm/ 1.7 x 0.5 inches (L x W); Air hole diameter: 0.3 cm; Weight: 2 g. Standard air hose inner diameter: 4-6 mm. Add little weight to your hose for smooth air circulation. IDEAL PUMP PROTECTORS - Effectively prevent water backflow in the event of power failure or pump shut down. Ideally protect your pump and reduce your loss when you are at work or on vacation. Sturdy plastic: reliable plastic that can be securely connected to the hose without air leaks or restrictions. Always keep your fish alive and endure long time use. Removable design: Easy to detach for cleaning and maintenance without using tools. Insert an object into the hole to open it when it is clogged and it restricts the airflow. ...