Our Non-Return Valve (Air) 1/4" is designed to allow compressed air to flow in one direction while blocking inverse flow to protect and maintain vacuum lines. Suitable for low-pressure applications, this valve is easily applied to low-pressure piping and is specifically designed for use with air (no other gases or liquids). With a working pressure range of 0 to 150 psi and a working temperature range of 0 to 60°C, this valve is a reliable choice for your air system needs.