Welcome to our shop We have an all copper vertical spring loaded check valve and a bottom valve stainless steel strainer available for purchase. The size of the check valve is 1 inch and it can withstand a pressure of 16 kg or 1.6 MPA. This check valve has a non-return function, which means it prevents the return of water, gas, and oil. When installing the valve, please ensure that the pipeline is clean to avoid any impurities from blocking the valve and causing malfunctions. Note: 1. Please allow small size error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. (Customer satisfaction is our top priority. If you find any product problems after receiving the goods, such as damage or incorrect quantity, please contact us immediately. We will try our best to provide you with satisfactory after sales service) Thank you for meeting me.I hope this helps you. Wish you a happy life.