MiJunHD 4mm Pneumatic Check Valve – 2PCS

**Prevent Backflow with Reliable Performance** – The MiJunHD **non-return check valve** ensures one-way airflow, protecting your air compressor, vacuum pump, or pneumatic system from reverse pressure damage. Each valve features **clear directional markings** for quick and error-free installation, while a **nickel-plated copper and PBT plastic body** delivers corrosion resistance, high durability, and smooth operation under pressures up to **1.0 MPa (145 psi)**. A built-in **sealing ring** guarantees a tight, leak-free connection every time.

**Tool-Free, Secure Connections** – The **push-to-connect design** locks onto compatible hoses (PU, nylon, or rubber) with a simple press-and-hold motion, eliminating the need for tools or adhesives. A **stainless steel card spring** maintains a firm grip, preventing loosening even after repeated connections or disconnections. Ideal for **industrial applications**—including CNC machines, assembly lines, and pneumatic tools—these valves provide consistent performance in high-demand environments. **Note:** Always push the tube fully through the sealing ring to avoid leaks or tube failure.