The check valves are applicable for fluid systems to prevent counter-current liquids. The one way check valves are made of stable material, sturdy, wear-resistant and durable for long-term use. The non-return check valves are widely applied for fish tank and aquarium, etc. Features - Color: White -Material:ABS - Size: 5.00X1.40X1.40cm/1.97X0.55X0.55in -Tip hole diameter: 4.5mm-Crafted from durable materials, this product is designed to deliver performance and withstand wear and tear. -With its multifunctional design, this product can be used in a variety of applications, making it a versatile addition to any tools. -This product has undergone rigorous testing to ensure its durability and stability, can trust it to perform reliably over time. -Thanks to its easy installation process, this product can be set up quickly and easily without the need for tools or expertise. -Featuring a large capacity and enough quantities per set, this product is designed to provide reliable water flow control and prevent backflow. Package list: 10 tank valve